11551520056 has 8 divisors (see below), whose sum is σ = 21659100120. Its totient is φ = 5775760024.

The previous prime is 11551520053. The next prime is 11551520059. The reversal of 11551520056 is 65002515511.

It is an interprime number because it is at equal distance from previous prime (11551520053) and next prime (11551520059).

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11551520053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 721969996 + ... + 721970011.

It is an arithmetic number, because the mean of its divisors is an integer number (2707387515).

Almost surely, 2^11551520056 is an apocalyptic number.

It is an amenable number.

11551520056 is a deficient number, since it is larger than the sum of its proper divisors (10107580064).

11551520056 is a wasteful number, since it uses less digits than its factorization.

11551520056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1443940013 (or 1443940009 counting only the distinct ones).

The product of its (nonzero) digits is 7500, while the sum is 31.

The spelling of 11551520056 in words is "eleven billion, five hundred fifty-one million, five hundred twenty thousand, fifty-six".