25661313461625 has 32 divisors (see below), whose sum is σ = 42700805012736. Its totient is φ = 13685912240000.

The previous prime is 25661313461579. The next prime is 25661313461633. The reversal of 25661313461625 is 52616431316652.

It is a happy number.

It is not a de Polignac number, because 25661313461625 - 2¹² = 25661313457529 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 55687165 + ... + 56146085.

It is an arithmetic number, because the mean of its divisors is an integer number (1334400156648).

Almost surely, 2^{25661313461625} is an apocalyptic number.

25661313461625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25661313461625 is a deficient number, since it is larger than the sum of its proper divisors (17039491551111).

25661313461625 is a wasteful number, since it uses less digits than its factorization.

25661313461625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 608050 (or 608040 counting only the distinct ones).

The product of its digits is 4665600, while the sum is 51.

The spelling of 25661313461625 in words is "twenty-five trillion, six hundred sixty-one billion, three hundred thirteen million, four hundred sixty-one thousand, six hundred twenty-five".