12161787579 has 32 divisors (see below), whose sum is σ = 18813949440. Its totient is φ = 7749932256.

The previous prime is 12161787569. The next prime is 12161787601. The reversal of 12161787579 is 97578716121.

12161787579 is a `hidden beast` number, since 1 + 2 + 1 + 61 + 7 + 8 + 7 + 579 = 666.

It is not a de Polignac number, because 12161787579 - 2⁹ = 12161787067 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12161787559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1004349 + ... + 1016385.

It is an arithmetic number, because the mean of its divisors is an integer number (587935920).

Almost surely, 2^12161787579 is an apocalyptic number.

12161787579 is a deficient number, since it is larger than the sum of its proper divisors (6652161861).

12161787579 is a wasteful number, since it uses less digits than its factorization.

12161787579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13696 (or 13690 counting only the distinct ones).

The product of its digits is 1481760, while the sum is 54.

The spelling of 12161787579 in words is "twelve billion, one hundred sixty-one million, seven hundred eighty-seven thousand, five hundred seventy-nine".