25605665305 has 32 divisors (see below), whose sum is σ = 35862883200. Its totient is φ = 17352921600.

The previous prime is 25605665299. The next prime is 25605665321. The reversal of 25605665305 is 50356650652.

It is not a de Polignac number, because 25605665305 - 2¹³ = 25605657113 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 137100 + ... + 264589.

It is an arithmetic number, because the mean of its divisors is an integer number (1120715100).

Almost surely, 2^25605665305 is an apocalyptic number.

It is an amenable number.

25605665305 is a deficient number, since it is larger than the sum of its proper divisors (10257217895).

25605665305 is a wasteful number, since it uses less digits than its factorization.

25605665305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401785.

The product of its (nonzero) digits is 810000, while the sum is 43.

The spelling of 25605665305 in words is "twenty-five billion, six hundred five million, six hundred sixty-five thousand, three hundred five".