656625251 has 2 divisors, whose sum is σ = 656625252. Its totient is φ = 656625250.

The previous prime is 656625247. The next prime is 656625349. The reversal of 656625251 is 152526656.

It is a happy number.

656625251 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 656625251 - 2² = 656625247 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (656625751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328312625 + 328312626.

It is an arithmetic number, because the mean of its divisors is an integer number (328312626).

Almost surely, 2^656625251 is an apocalyptic number.

656625251 is a deficient number, since it is larger than the sum of its proper divisors (1).

656625251 is an equidigital number, since it uses as much as digits as its factorization.

656625251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108000, while the sum is 38.

The square root of 656625251 is about 25624.7000177563. The cubic root of 656625251 is about 869.1722655306.

The spelling of 656625251 in words is "six hundred fifty-six million, six hundred twenty-five thousand, two hundred fifty-one".