11551512520 has 16 divisors (see below), whose sum is σ = 25990903260. Its totient is φ = 4620604992.

The previous prime is 11551512503. The next prime is 11551512523. The reversal of 11551512520 is 2521515511.

It can be written as a sum of positive squares in 2 ways, for example, as 11360575396 + 190937124 = 106586^2 + 13818^2 .

It is not an unprimeable number, because it can be changed into a prime (11551512523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144393867 + ... + 144393946.

Almost surely, 2^11551512520 is an apocalyptic number.

11551512520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11551512520 is an abundant number, since it is smaller than the sum of its proper divisors (14439390740).

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

11551512520 is a wasteful number, since it uses less digits than its factorization.

11551512520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288787824 (or 288787820 counting only the distinct ones).

The product of its (nonzero) digits is 2500, while the sum is 28.

The spelling of 11551512520 in words is "eleven billion, five hundred fifty-one million, five hundred twelve thousand, five hundred twenty".