11815756816 has 20 divisors (see below), whose sum is σ = 22980082752. Its totient is φ = 5885412896.

The previous prime is 11815756787. The next prime is 11815756837. The reversal of 11815756816 is 61865751811.

It is a super-2 number, since 2×11815756816² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 11815756816.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1399756 + ... + 1408171.

Almost surely, 2^11815756816 is an apocalyptic number.

11815756816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

11815756816 is a deficient number, since it is larger than the sum of its proper divisors (11164325936).

11815756816 is a wasteful number, since it uses less digits than its factorization.

11815756816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2808198 (or 2808192 counting only the distinct ones).

The product of its digits is 403200, while the sum is 49.

The spelling of 11815756816 in words is "eleven billion, eight hundred fifteen million, seven hundred fifty-six thousand, eight hundred sixteen".