12257891124779 has 4 divisors (see below), whose sum is σ = 12257945692440. Its totient is φ = 12257836557120.

The previous prime is 12257891124733. The next prime is 12257891124793. The reversal of 12257891124779 is 97742119875221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12257891124779 - 2²⁰ = 12257890076203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12257891126779) 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, 26945477 + ... + 27396614.

It is an arithmetic number, because the mean of its divisors is an integer number (3064486423110).

Almost surely, 2^{12257891124779} is an apocalyptic number.

12257891124779 is a deficient number, since it is larger than the sum of its proper divisors (54567661).

12257891124779 is an equidigital number, since it uses as much as digits as its factorization.

12257891124779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54567660.

The product of its digits is 35562240, while the sum is 65.

The spelling of 12257891124779 in words is "twelve trillion, two hundred fifty-seven billion, eight hundred ninety-one million, one hundred twenty-four thousand, seven hundred seventy-nine".