656643125 has 20 divisors (see below), whose sum is σ = 825420156. Its totient is φ = 522192000.

The previous prime is 656643109. The next prime is 656643131. The reversal of 656643125 is 521346656.

It is a happy number.

It can be written as a sum of positive squares in 10 ways, for example, as 203889841 + 452753284 = 14279^2 + 21278^2 .

It is not a de Polignac number, because 656643125 - 2⁴ = 656643109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 105089 + ... + 111161.

Almost surely, 2^656643125 is an apocalyptic number.

It is an amenable number.

656643125 is a deficient number, since it is larger than the sum of its proper divisors (168777031).

656643125 is an equidigital number, since it uses as much as digits as its factorization.

656643125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6266 (or 6251 counting only the distinct ones).

The product of its digits is 129600, while the sum is 38.

The square root of 656643125 is about 25625.0487804414. The cubic root of 656643125 is about 869.1801520402.

The spelling of 656643125 in words is "six hundred fifty-six million, six hundred forty-three thousand, one hundred twenty-five".