656487668687 has 2 divisors, whose sum is σ = 656487668688. Its totient is φ = 656487668686.

The previous prime is 656487668677. The next prime is 656487668689. The reversal of 656487668687 is 786866784656.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 656487668687 - 2²⁴ = 656470891471 is a prime.

Together with 656487668689, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (656487668689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328243834343 + 328243834344.

It is an arithmetic number, because the mean of its divisors is an integer number (328243834344).

Almost surely, 2^656487668687 is an apocalyptic number.

656487668687 is a deficient number, since it is larger than the sum of its proper divisors (1).

656487668687 is an equidigital number, since it uses as much as digits as its factorization.

656487668687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3901685760, while the sum is 77.

The spelling of 656487668687 in words is "six hundred fifty-six billion, four hundred eighty-seven million, six hundred sixty-eight thousand, six hundred eighty-seven".