319977566681 has 2 divisors, whose sum is σ = 319977566682. Its totient is φ = 319977566680.

The previous prime is 319977566677. The next prime is 319977566707. The reversal of 319977566681 is 186665779913.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 286884499456 + 33093067225 = 535616^2 + 181915^2 .

It is a cyclic number.

It is not a de Polignac number, because 319977566681 - 2² = 319977566677 is a prime.

It is a super-2 number, since 2×319977566681² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (319977566641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159988783340 + 159988783341.

It is an arithmetic number, because the mean of its divisors is an integer number (159988783341).

Almost surely, 2^319977566681 is an apocalyptic number.

It is an amenable number.

319977566681 is a deficient number, since it is larger than the sum of its proper divisors (1).

319977566681 is an equidigital number, since it uses as much as digits as its factorization.

319977566681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 102876480, while the sum is 68.

The spelling of 319977566681 in words is "three hundred nineteen billion, nine hundred seventy-seven million, five hundred sixty-six thousand, six hundred eighty-one".