656216656679 has 2 divisors, whose sum is σ = 656216656680. Its totient is φ = 656216656678.

The previous prime is 656216656673. The next prime is 656216656699. The reversal of 656216656679 is 976656612656.

656216656679 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 a de Polignac number, because none of the positive numbers 2^k-656216656679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (656216656673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328108328339 + 328108328340.

It is an arithmetic number, because the mean of its divisors is an integer number (328108328340).

Almost surely, 2^656216656679 is an apocalyptic number.

656216656679 is a deficient number, since it is larger than the sum of its proper divisors (1).

656216656679 is an equidigital number, since it uses as much as digits as its factorization.

656216656679 is an evil number, because the sum of its binary digits is even.

The product of its digits is 146966400, while the sum is 65.

The spelling of 656216656679 in words is "six hundred fifty-six billion, two hundred sixteen million, six hundred fifty-six thousand, six hundred seventy-nine".