11819915956 has 12 divisors (see below), whose sum is σ = 21243903268. Its totient is φ = 5750229312.

The previous prime is 11819915951. The next prime is 11819915957. The reversal of 11819915956 is 65951991811.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 5801259556 + 6018656400 = 76166^2 + 77580^2 .

It is a junction number, because it is equal to n+sod(n) for n = 11819915897 and 11819915906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11819915951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39932001 + ... + 39932296.

Almost surely, 2^11819915956 is an apocalyptic number.

It is an amenable number.

11819915956 is a deficient number, since it is larger than the sum of its proper divisors (9423987312).

11819915956 is a wasteful number, since it uses less digits than its factorization.

11819915956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79864338 (or 79864336 counting only the distinct ones).

The product of its digits is 874800, while the sum is 55.

The spelling of 11819915956 in words is "eleven billion, eight hundred nineteen million, nine hundred fifteen thousand, nine hundred fifty-six".