15399974879 has 2 divisors, whose sum is σ = 15399974880. Its totient is φ = 15399974878.

The previous prime is 15399974851. The next prime is 15399974881. The reversal of 15399974879 is 97847999351.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 15399974879 - 2³² = 11105007583 is a prime.

Together with 15399974881, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15399974179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7699987439 + 7699987440.

It is an arithmetic number, because the mean of its divisors is an integer number (7699987440).

Almost surely, 2^15399974879 is an apocalyptic number.

15399974879 is a deficient number, since it is larger than the sum of its proper divisors (1).

15399974879 is an equidigital number, since it uses as much as digits as its factorization.

15399974879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 154314720, while the sum is 71.

The spelling of 15399974879 in words is "fifteen billion, three hundred ninety-nine million, nine hundred seventy-four thousand, eight hundred seventy-nine".