25804311979 has 2 divisors, whose sum is σ = 25804311980. Its totient is φ = 25804311978.

The previous prime is 25804311971. The next prime is 25804312057. The reversal of 25804311979 is 97911340852.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25804311979 - 2³ = 25804311971 is a prime.

It is not a weakly prime, because it can be changed into another prime (25804311971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12902155989 + 12902155990.

It is an arithmetic number, because the mean of its divisors is an integer number (12902155990).

Almost surely, 2^25804311979 is an apocalyptic number.

25804311979 is a deficient number, since it is larger than the sum of its proper divisors (1).

25804311979 is an equidigital number, since it uses as much as digits as its factorization.

25804311979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 544320, while the sum is 49.

The spelling of 25804311979 in words is "twenty-five billion, eight hundred four million, three hundred eleven thousand, nine hundred seventy-nine".