25655657 has 8 divisors (see below), whose sum is σ = 26385480. Its totient is φ = 24935040.

The previous prime is 25655653. The next prime is 25655659. The reversal of 25655657 is 75655652.

It can be written as a sum of positive squares in 4 ways, for example, as 7027801 + 18627856 = 2651^2 + 4316^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25655657 - 2² = 25655653 is a prime.

It is a super-2 number, since 2×25655657² = 1316425472203298, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25655653) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3557 + ... + 7997.

It is an arithmetic number, because the mean of its divisors is an integer number (3298185).

Almost surely, 2^25655657 is an apocalyptic number.

It is an amenable number.

25655657 is a deficient number, since it is larger than the sum of its proper divisors (729823).

25655657 is a wasteful number, since it uses less digits than its factorization.

25655657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4603.

The product of its digits is 315000, while the sum is 41.

The square root of 25655657 is about 5065.1413603176. The cubic root of 25655657 is about 294.9359508560.

The spelling of 25655657 in words is "twenty-five million, six hundred fifty-five thousand, six hundred fifty-seven".