11956915856 has 40 divisors (see below), whose sum is σ = 23938807104. Its totient is φ = 5781144960.

The previous prime is 11956915837. The next prime is 11956915909. The reversal of 11956915856 is 65851965911.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34541 + ... + 158451.

Almost surely, 2^11956915856 is an apocalyptic number.

11956915856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

11956915856 is an abundant number, since it is smaller than the sum of its proper divisors (11981891248).

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

11956915856 is a wasteful number, since it uses less digits than its factorization.

11956915856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124119 (or 124113 counting only the distinct ones).

The product of its digits is 2916000, while the sum is 56.

The spelling of 11956915856 in words is "eleven billion, nine hundred fifty-six million, nine hundred fifteen thousand, eight hundred fifty-six".