11511551056 has 10 divisors (see below), whose sum is σ = 22303630202. Its totient is φ = 5755775520.

The previous prime is 11511551041. The next prime is 11511551059. The reversal of 11511551056 is 65015511511.

It can be written as a sum of positive squares in only one way, i.e., 11504707600 + 6843456 = 107260^2 + 2616^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11511551059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 359735955 + ... + 359735986.

Almost surely, 2^11511551056 is an apocalyptic number.

11511551056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

11511551056 is a deficient number, since it is larger than the sum of its proper divisors (10792079146).

11511551056 is an equidigital number, since it uses as much as digits as its factorization.

11511551056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 719471949 (or 719471943 counting only the distinct ones).

The product of its (nonzero) digits is 3750, while the sum is 31.

The spelling of 11511551056 in words is "eleven billion, five hundred eleven million, five hundred fifty-one thousand, fifty-six".