656555625 has 140 divisors (see below), whose sum is σ = 1352154672. Its totient is φ = 315900000.

The previous prime is 656555617. The next prime is 656555629. The reversal of 656555625 is 526555656.

656555625 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 656555625 - 2³ = 656555617 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

Its product of digits (1350000) is a multiple of the sum of its prime divisors (150).

It is not an unprimeable number, because it can be changed into a prime (656555629) by changing a digit.

It is a polite number, since it can be written in 139 ways as a sum of consecutive naturals, for example, 5011810 + ... + 5011940.

Almost surely, 2^656555625 is an apocalyptic number.

It is an amenable number.

656555625 is an abundant number, since it is smaller than the sum of its proper divisors (695599047).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

656555625 is an equidigital number, since it uses as much as digits as its factorization.

656555625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180 (or 150 counting only the distinct ones).

The product of its digits is 1350000, while the sum is 45.

The square root of 656555625 is about 25623.3414097381. The cubic root of 656555625 is about 869.1415432238.

The spelling of 656555625 in words is "six hundred fifty-six million, five hundred fifty-five thousand, six hundred twenty-five".