11813161978 has 16 divisors (see below), whose sum is σ = 17807176296. Its totient is φ = 5877469440.

The previous prime is 11813161961. The next prime is 11813161991. The reversal of 11813161978 is 87916131811.

11813161978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 2055080889 + 9758081089 = 45333^2 + 98783^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 809668 + ... + 824128.

Almost surely, 2^11813161978 is an apocalyptic number.

11813161978 is a deficient number, since it is larger than the sum of its proper divisors (5994014318).

11813161978 is a wasteful number, since it uses less digits than its factorization.

11813161978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16449.

The product of its digits is 72576, while the sum is 46.

The spelling of 11813161978 in words is "eleven billion, eight hundred thirteen million, one hundred sixty-one thousand, nine hundred seventy-eight".