25606979305 has 4 divisors (see below), whose sum is σ = 30728375172. Its totient is φ = 20485583440.

The previous prime is 25606979297. The next prime is 25606979329. The reversal of 25606979305 is 50397960652.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13684086441 + 11922892864 = 116979^2 + 109192^2 .

It is not a de Polignac number, because 25606979305 - 2³ = 25606979297 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2560697926 + ... + 2560697935.

It is an arithmetic number, because the mean of its divisors is an integer number (7682093793).

Almost surely, 2^25606979305 is an apocalyptic number.

It is an amenable number.

25606979305 is a deficient number, since it is larger than the sum of its proper divisors (5121395867).

25606979305 is an equidigital number, since it uses as much as digits as its factorization.

25606979305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5121395866.

The product of its (nonzero) digits is 3061800, while the sum is 52.

The spelling of 25606979305 in words is "twenty-five billion, six hundred six million, nine hundred seventy-nine thousand, three hundred five".