656624651 has 2 divisors, whose sum is σ = 656624652. Its totient is φ = 656624650.

The previous prime is 656624623. The next prime is 656624659. The reversal of 656624651 is 156426656.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 656624651 - 2¹⁸ = 656362507 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 656624599 and 656624608.

It is not a weakly prime, because it can be changed into another prime (656624659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328312325 + 328312326.

It is an arithmetic number, because the mean of its divisors is an integer number (328312326).

Almost surely, 2^656624651 is an apocalyptic number.

656624651 is a deficient number, since it is larger than the sum of its proper divisors (1).

656624651 is an equidigital number, since it uses as much as digits as its factorization.

656624651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 259200, while the sum is 41.

The square root of 656624651 is about 25624.6883102995. The cubic root of 656624651 is about 869.1720007913.

The spelling of 656624651 in words is "six hundred fifty-six million, six hundred twenty-four thousand, six hundred fifty-one".