656787916801 has 2 divisors, whose sum is σ = 656787916802. Its totient is φ = 656787916800.

The previous prime is 656787916727. The next prime is 656787916817. The reversal of 656787916801 is 108619787656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 430545945600 + 226241971201 = 656160^2 + 475649^2 .

It is a cyclic number.

It is not a de Polignac number, because 656787916801 - 2¹⁵ = 656787884033 is a prime.

It is not a weakly prime, because it can be changed into another prime (656787116801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328393958400 + 328393958401.

It is an arithmetic number, because the mean of its divisors is an integer number (328393958401).

Almost surely, 2^656787916801 is an apocalyptic number.

It is an amenable number.

656787916801 is a deficient number, since it is larger than the sum of its proper divisors (1).

656787916801 is an equidigital number, since it uses as much as digits as its factorization.

656787916801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30481920, while the sum is 64.

The spelling of 656787916801 in words is "six hundred fifty-six billion, seven hundred eighty-seven million, nine hundred sixteen thousand, eight hundred one".