12156994955 has 16 divisors (see below), whose sum is σ = 16678379520. Its totient is φ = 8333260512.

The previous prime is 12156994943. The next prime is 12156994957. The reversal of 12156994955 is 55949965121.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 12156994955 - 2⁸ = 12156994699 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12156994955.

It is not an unprimeable number, because it can be changed into a prime (12156994957) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40442 + ... + 161088.

It is an arithmetic number, because the mean of its divisors is an integer number (1042398720).

Almost surely, 2^12156994955 is an apocalyptic number.

12156994955 is a deficient number, since it is larger than the sum of its proper divisors (4521384565).

12156994955 is a wasteful number, since it uses less digits than its factorization.

12156994955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123538.

The product of its digits is 4374000, while the sum is 56.

The spelling of 12156994955 in words is "twelve billion, one hundred fifty-six million, nine hundred ninety-four thousand, nine hundred fifty-five".