12157917474917 has 4 divisors (see below), whose sum is σ = 12416596570176. Its totient is φ = 11899238379660.

The previous prime is 12157917474889. The next prime is 12157917474943. The reversal of 12157917474917 is 71947471975121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12157917474917 - 2²² = 12157913280613 is a prime.

It is a super-2 number, since 2×12157917474917² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12157917074917) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 129339547559 + ... + 129339547652.

It is an arithmetic number, because the mean of its divisors is an integer number (3104149142544).

Almost surely, 2^{12157917474917} is an apocalyptic number.

It is an amenable number.

12157917474917 is a deficient number, since it is larger than the sum of its proper divisors (258679095259).

12157917474917 is an equidigital number, since it uses as much as digits as its factorization.

12157917474917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258679095258.

The product of its digits is 31116960, while the sum is 65.

The spelling of 12157917474917 in words is "twelve trillion, one hundred fifty-seven billion, nine hundred seventeen million, four hundred seventy-four thousand, nine hundred seventeen".