11203520231556 has 27 divisors (see below), whose sum is σ = 28320060239653. Its totient is φ = 3734500049520.

The previous prime is 11203520231539. The next prime is 11203520231557. The reversal of 11203520231556 is 65513202530211.

The square root of 11203520231556 is 3347166.

It is a perfect power (a square), and thus also a powerful number.

11203520231556 is a `hidden beast` number, since 1 + 1 + 20 + 3 + 52 + 0 + 2 + 31 + 556 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1250000025156 + 9953520206400 = 1118034^2 + 3154920^2 .

It is a super-3 number, since 3×11203520231556³ (a number of 40 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11203520231556.

It is not an unprimeable number, because it can be changed into a prime (11203520231557) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 19804066 + ... + 20361926.

Almost surely, 2^{11203520231556} is an apocalyptic number.

11203520231556 is the 3347166-th square number.

It is an amenable number.

11203520231556 is an abundant number, since it is smaller than the sum of its proper divisors (17116540008097).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11203520231556 is an frugal number, since it uses more digits than its factorization.

11203520231556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1115732 (or 557866 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

Multiplying 11203520231556 by its sum of digits (36), we get a square (403326728336016 = 20082996²).

11203520231556 divided by its sum of digits (36) gives a square (311208895321 = 557861²).

Adding to 11203520231556 its reverse (65513202530211), we get a palindrome (76716722761767).

The spelling of 11203520231556 in words is "eleven trillion, two hundred three billion, five hundred twenty million, two hundred thirty-one thousand, five hundred fifty-six".