25600645655 has 16 divisors (see below), whose sum is σ = 33116784960. Its totient is φ = 18886307328.

The previous prime is 25600645643. The next prime is 25600645709. The reversal of 25600645655 is 55654600652.

It is a cyclic number.

It is not a de Polignac number, because 25600645655 - 2⁶ = 25600645591 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 129587 + ... + 260756.

It is an arithmetic number, because the mean of its divisors is an integer number (2069799060).

Almost surely, 2^25600645655 is an apocalyptic number.

25600645655 is a deficient number, since it is larger than the sum of its proper divisors (7516139305).

25600645655 is a wasteful number, since it uses less digits than its factorization.

25600645655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391370.

The product of its (nonzero) digits is 1080000, while the sum is 44.

The spelling of 25600645655 in words is "twenty-five billion, six hundred million, six hundred forty-five thousand, six hundred fifty-five".