12939998557 has 4 divisors (see below), whose sum is σ = 13240928800. Its totient is φ = 12639068316.

The previous prime is 12939998521. The next prime is 12939998581. The reversal of 12939998557 is 75589993921.

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 12939998557 - 2²⁷ = 12805780829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12939998492 and 12939998501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12939998657) 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, 150465057 + ... + 150465142.

It is an arithmetic number, because the mean of its divisors is an integer number (3310232200).

Almost surely, 2^12939998557 is an apocalyptic number.

It is an amenable number.

12939998557 is a deficient number, since it is larger than the sum of its proper divisors (300930243).

12939998557 is an equidigital number, since it uses as much as digits as its factorization.

12939998557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300930242.

The product of its digits is 55112400, while the sum is 67.

The spelling of 12939998557 in words is "twelve billion, nine hundred thirty-nine million, nine hundred ninety-eight thousand, five hundred fifty-seven".