12557109379 has 4 divisors (see below), whose sum is σ = 12655984384. Its totient is φ = 12458234376.

The previous prime is 12557109377. The next prime is 12557109479. The reversal of 12557109379 is 97390175521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97390175521 = 145633 ⋅668737.

It is a cyclic number.

It is not a de Polignac number, because 12557109379 - 2¹ = 12557109377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12557109373) 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, 49437312 + ... + 49437565.

It is an arithmetic number, because the mean of its divisors is an integer number (3163996096).

Almost surely, 2^12557109379 is an apocalyptic number.

12557109379 is a deficient number, since it is larger than the sum of its proper divisors (98875005).

12557109379 is an equidigital number, since it uses as much as digits as its factorization.

12557109379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98875004.

The product of its (nonzero) digits is 595350, while the sum is 49.

The spelling of 12557109379 in words is "twelve billion, five hundred fifty-seven million, one hundred nine thousand, three hundred seventy-nine".