656217999677 has 2 divisors, whose sum is σ = 656217999678. Its totient is φ = 656217999676.

The previous prime is 656217999667. The next prime is 656217999707. The reversal of 656217999677 is 776999712656.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 582628416601 + 73589583076 = 763301^2 + 271274^2 .

It is a cyclic number.

It is not a de Polignac number, because 656217999677 - 2¹² = 656217995581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (656217999637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328108999838 + 328108999839.

It is an arithmetic number, because the mean of its divisors is an integer number (328108999839).

Almost surely, 2^656217999677 is an apocalyptic number.

It is an amenable number.

656217999677 is a deficient number, since it is larger than the sum of its proper divisors (1).

656217999677 is an equidigital number, since it uses as much as digits as its factorization.

656217999677 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 540101520, while the sum is 74.

The spelling of 656217999677 in words is "six hundred fifty-six billion, two hundred seventeen million, nine hundred ninety-nine thousand, six hundred seventy-seven".