25640563930 has 16 divisors (see below), whose sum is σ = 46154974464. Its totient is φ = 10255790160.

The previous prime is 25640563903. The next prime is 25640563951. The reversal of 25640563930 is 3936504652.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 307519 + ... + 381901.

It is an arithmetic number, because the mean of its divisors is an integer number (2884685904).

Almost surely, 2^25640563930 is an apocalyptic number.

25640563930 is a deficient number, since it is larger than the sum of its proper divisors (20514410534).

25640563930 is a wasteful number, since it uses less digits than its factorization.

25640563930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108861.

The product of its (nonzero) digits is 583200, while the sum is 43.

The spelling of 25640563930 in words is "twenty-five billion, six hundred forty million, five hundred sixty-three thousand, nine hundred thirty".