25640648555 has 16 divisors (see below), whose sum is σ = 31838788800. Its totient is φ = 19799579520.

The previous prime is 25640648533. The next prime is 25640648587. The reversal of 25640648555 is 55584604652.

It is not a de Polignac number, because 25640648555 - 2¹² = 25640644459 is a prime.

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, 530906 + ... + 577184.

It is an arithmetic number, because the mean of its divisors is an integer number (1989924300).

Almost surely, 2^25640648555 is an apocalyptic number.

25640648555 is a deficient number, since it is larger than the sum of its proper divisors (6198140245).

25640648555 is a wasteful number, since it uses less digits than its factorization.

25640648555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50134.

The product of its (nonzero) digits is 5760000, while the sum is 50.

The spelling of 25640648555 in words is "twenty-five billion, six hundred forty million, six hundred forty-eight thousand, five hundred fifty-five".