25457661 has 6 divisors (see below), whose sum is σ = 36772190. Its totient is φ = 16971768.

The previous prime is 25457639. The next prime is 25457681. The reversal of 25457661 is 16675452.

It is a happy number.

25457661 is a `hidden beast` number, since 25 + 4 + 576 + 61 = 666.

It can be written as a sum of positive squares in only one way, i.e., 17589636 + 7868025 = 4194^2 + 2805^2 .

It is not a de Polignac number, because 25457661 - 2⁷ = 25457533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25457681) 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, 1414306 + ... + 1414323.

Almost surely, 2^25457661 is an apocalyptic number.

It is an amenable number.

25457661 is a deficient number, since it is larger than the sum of its proper divisors (11314529).

25457661 is a wasteful number, since it uses less digits than its factorization.

25457661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2828635 (or 2828632 counting only the distinct ones).

The product of its digits is 50400, while the sum is 36.

The square root of 25457661 is about 5045.5585419258. The cubic root of 25457661 is about 294.1752738010.

The spelling of 25457661 in words is "twenty-five million, four hundred fifty-seven thousand, six hundred sixty-one".