25257924261 has 6 divisors (see below), whose sum is σ = 36483668390. Its totient is φ = 16838616168.

The previous prime is 25257924247. The next prime is 25257924271. The reversal of 25257924261 is 16242975252.

25257924261 is a `hidden beast` number, since 2 + 52 + 579 + 2 + 4 + 26 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 19815911361 + 5442012900 = 140769^2 + 73770^2 .

It is not a de Polignac number, because 25257924261 - 2¹⁰ = 25257923237 is a prime.

It is a super-2 number, since 2×25257924261² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25257924271) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1403218006 + ... + 1403218023.

Almost surely, 2^25257924261 is an apocalyptic number.

It is an amenable number.

25257924261 is a deficient number, since it is larger than the sum of its proper divisors (11225744129).

25257924261 is a wasteful number, since it uses less digits than its factorization.

25257924261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2806436035 (or 2806436032 counting only the distinct ones).

The product of its digits is 604800, while the sum is 45.

The spelling of 25257924261 in words is "twenty-five billion, two hundred fifty-seven million, nine hundred twenty-four thousand, two hundred sixty-one".