11911961915 has 16 divisors (see below), whose sum is σ = 16444600320. Its totient is φ = 8114104800.

The previous prime is 11911961891. The next prime is 11911961921. The reversal of 11911961915 is 51916911911.

It is a happy number.

It is not a de Polignac number, because 11911961915 - 2²⁶ = 11844853051 is a prime.

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, 1121675 + ... + 1132244.

It is an arithmetic number, because the mean of its divisors is an integer number (1027787520).

Almost surely, 2^11911961915 is an apocalyptic number.

11911961915 is a deficient number, since it is larger than the sum of its proper divisors (4532638405).

11911961915 is a wasteful number, since it uses less digits than its factorization.

11911961915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2254082.

The product of its digits is 21870, while the sum is 44.

The spelling of 11911961915 in words is "eleven billion, nine hundred eleven million, nine hundred sixty-one thousand, nine hundred fifteen".