25613530464 has 24 divisors (see below), whose sum is σ = 67235517720. Its totient is φ = 8537843456.

The previous prime is 25613530441. The next prime is 25613530493. The reversal of 25613530464 is 46403531652.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133403709 + ... + 133403900.

It is an arithmetic number, because the mean of its divisors is an integer number (2801479905).

Almost surely, 2^25613530464 is an apocalyptic number.

25613530464 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

25613530464 is an abundant number, since it is smaller than the sum of its proper divisors (41621987256).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25613530464 is a wasteful number, since it uses less digits than its factorization.

25613530464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266807622 (or 266807614 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 39.

The spelling of 25613530464 in words is "twenty-five billion, six hundred thirteen million, five hundred thirty thousand, four hundred sixty-four".