25997620725 has 36 divisors (see below), whose sum is σ = 46931329536. Its totient is φ = 13756206240.

The previous prime is 25997620703. The next prime is 25997620729. The reversal of 25997620725 is 52702679952.

25997620725 is a `hidden beast` number, since 2 + 5 + 9 + 9 + 7 + 620 + 7 + 2 + 5 = 666.

It is not a de Polignac number, because 25997620725 - 2¹¹ = 25997618677 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25997620729) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 426327 + ... + 483476.

Almost surely, 2^25997620725 is an apocalyptic number.

25997620725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25997620725 is a deficient number, since it is larger than the sum of its proper divisors (20933708811).

25997620725 is a wasteful number, since it uses less digits than its factorization.

25997620725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 909946 (or 909938 counting only the distinct ones).

The product of its (nonzero) digits is 4762800, while the sum is 54.

The spelling of 25997620725 in words is "twenty-five billion, nine hundred ninety-seven million, six hundred twenty thousand, seven hundred twenty-five".