316813811661 has 24 divisors (see below), whose sum is σ = 463227069240. Its totient is φ = 208626080256.

The previous prime is 316813811599. The next prime is 316813811681. The reversal of 316813811661 is 166118318613.

316813811661 is a `hidden beast` number, since 31 + 6 + 81 + 381 + 166 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 7004685636 + 309809126025 = 83694^2 + 556605^2 .

It is not a de Polignac number, because 316813811661 - 2²⁵ = 316780257229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (316813811681) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 600241 + ... + 996953.

It is an arithmetic number, because the mean of its divisors is an integer number (19301127885).

Almost surely, 2^316813811661 is an apocalyptic number.

It is an amenable number.

316813811661 is a deficient number, since it is larger than the sum of its proper divisors (146413257579).

316813811661 is a wasteful number, since it uses less digits than its factorization.

316813811661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397805 (or 397802 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The spelling of 316813811661 in words is "three hundred sixteen billion, eight hundred thirteen million, eight hundred eleven thousand, six hundred sixty-one".