253625661 has 28 divisors (see below), whose sum is σ = 400300320. Its totient is φ = 160175880.

The previous prime is 253625651. The next prime is 253625681. The reversal of 253625661 is 166526352.

It is a happy number.

253625661 is a `hidden beast` number, since 25 + 3 + 625 + 6 + 6 + 1 = 666.

It is not a de Polignac number, because 253625661 - 2⁶ = 253625597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253625611) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 4696 + ... + 23006.

It is an arithmetic number, because the mean of its divisors is an integer number (14296440).

Almost surely, 2^253625661 is an apocalyptic number.

It is an amenable number.

253625661 is a deficient number, since it is larger than the sum of its proper divisors (146674659).

253625661 is an equidigital number, since it uses as much as digits as its factorization.

253625661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18348 (or 18333 counting only the distinct ones).

The product of its digits is 64800, while the sum is 36.

The square root of 253625661 is about 15925.6290613589. The cubic root of 253625661 is about 632.9912848916.

The spelling of 253625661 in words is "two hundred fifty-three million, six hundred twenty-five thousand, six hundred sixty-one".