25565604965 has 32 divisors (see below), whose sum is σ = 32431985280. Its totient is φ = 19316786944.

The previous prime is 25565604949. The next prime is 25565604997. The reversal of 25565604965 is 56940656552.

It is a cyclic number.

It is not a de Polignac number, because 25565604965 - 2⁴ = 25565604949 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2661902 + ... + 2671488.

It is an arithmetic number, because the mean of its divisors is an integer number (1013499540).

Almost surely, 2^25565604965 is an apocalyptic number.

It is an amenable number.

25565604965 is a deficient number, since it is larger than the sum of its proper divisors (6866380315).

25565604965 is a wasteful number, since it uses less digits than its factorization.

25565604965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10021.

The product of its (nonzero) digits is 9720000, while the sum is 53.

The spelling of 25565604965 in words is "twenty-five billion, five hundred sixty-five million, six hundred four thousand, nine hundred sixty-five".