25697693025 has 27 divisors (see below), whose sum is σ = 46031730771. Its totient is φ = 13704153840.

The previous prime is 25697693011. The next prime is 25697693033. The reversal of 25697693025 is 52039679652.

The square root of 25697693025 is 160305.

It is a perfect power (a square), and thus also a powerful number.

25697693025 is a `hidden beast` number, since 2 + 569 + 76 + 9 + 3 + 0 + 2 + 5 = 666.

It can be written as a sum of positive squares in only one way, i.e., 9251169489 + 16446523536 = 96183^2 + 128244^2 .

It is a de Polignac number, because none of the positive numbers 2^k-25697693025 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 2399232 + ... + 2409918.

Almost surely, 2^25697693025 is an apocalyptic number.

25697693025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

25697693025 is the 160305-th square number.

25697693025 is the 80153-rd centered octagonal number.

It is an amenable number.

25697693025 is a deficient number, since it is larger than the sum of its proper divisors (20334037746).

25697693025 is an frugal number, since it uses more digits than its factorization.

25697693025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21390 (or 10695 counting only the distinct ones).

The product of its (nonzero) digits is 6123600, while the sum is 54.

The spelling of 25697693025 in words is "twenty-five billion, six hundred ninety-seven million, six hundred ninety-three thousand, twenty-five".