11705621520 has 40 divisors (see below), whose sum is σ = 36287427456. Its totient is φ = 3121499008.

The previous prime is 11705621497. The next prime is 11705621531. The reversal of 11705621520 is 2512650711.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×11705621520² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24386472 + ... + 24386951.

Almost surely, 2^11705621520 is an apocalyptic number.

11705621520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11705621520 is an abundant number, since it is smaller than the sum of its proper divisors (24581805936).

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

11705621520 is a wasteful number, since it uses less digits than its factorization.

11705621520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48773439 (or 48773433 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 30.

The spelling of 11705621520 in words is "eleven billion, seven hundred five million, six hundred twenty-one thousand, five hundred twenty".