11551975968 has 96 divisors (see below), whose sum is σ = 32797529856. Its totient is φ = 3539109888.

The previous prime is 11551975957. The next prime is 11551975991. The reversal of 11551975968 is 86957915511.

It is a tau number, because it is divible by the number of its divisors (96).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 270921 + ... + 310647.

It is an arithmetic number, because the mean of its divisors is an integer number (341640936).

Almost surely, 2^11551975968 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11551975968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16398764928).

11551975968 is an abundant number, since it is smaller than the sum of its proper divisors (21245553888).

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

11551975968 is a wasteful number, since it uses less digits than its factorization.

11551975968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39986 (or 39978 counting only the distinct ones).

The product of its digits is 3402000, while the sum is 57.

The spelling of 11551975968 in words is "eleven billion, five hundred fifty-one million, nine hundred seventy-five thousand, nine hundred sixty-eight".