25667311979 has 4 divisors (see below), whose sum is σ = 25668187584. Its totient is φ = 25666436376.

The previous prime is 25667311961. The next prime is 25667311991. The reversal of 25667311979 is 97911376652.

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 25667311979 - 2⁸ = 25667311723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25667310979) 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, 392252 + ... + 452985.

It is an arithmetic number, because the mean of its divisors is an integer number (6417046896).

Almost surely, 2^25667311979 is an apocalyptic number.

25667311979 is a deficient number, since it is larger than the sum of its proper divisors (875605).

25667311979 is an equidigital number, since it uses as much as digits as its factorization.

25667311979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 875604.

The product of its digits is 4286520, while the sum is 56.

The spelling of 25667311979 in words is "twenty-five billion, six hundred sixty-seven million, three hundred eleven thousand, nine hundred seventy-nine".