11551308880 has 20 divisors (see below), whose sum is σ = 26856793332. Its totient is φ = 4620523520.

The previous prime is 11551308841. The next prime is 11551308917. The reversal of 11551308880 is 8880315511.

It can be written as a sum of positive squares in 2 ways, for example, as 5540718096 + 6010590784 = 74436^2 + 77528^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72195601 + ... + 72195760.

Almost surely, 2^11551308880 is an apocalyptic number.

11551308880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11551308880 is an abundant number, since it is smaller than the sum of its proper divisors (15305484452).

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

11551308880 is a wasteful number, since it uses less digits than its factorization.

11551308880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144391374 (or 144391368 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 40.

The spelling of 11551308880 in words is "eleven billion, five hundred fifty-one million, three hundred eight thousand, eight hundred eighty".