11918909979 has 24 divisors (see below), whose sum is σ = 17624118512. Its totient is φ = 7757830080.

The previous prime is 11918909953. The next prime is 11918909999. The reversal of 11918909979 is 97990981911.

It is not a de Polignac number, because 11918909979 - 2⁹ = 11918909467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11918909939) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1170249 + ... + 1180389.

Almost surely, 2^11918909979 is an apocalyptic number.

11918909979 is a deficient number, since it is larger than the sum of its proper divisors (5705208533).

11918909979 is a wasteful number, since it uses less digits than its factorization.

11918909979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13227 (or 13224 counting only the distinct ones).

The product of its (nonzero) digits is 3306744, while the sum is 63.

The spelling of 11918909979 in words is "eleven billion, nine hundred eighteen million, nine hundred nine thousand, nine hundred seventy-nine".