316661661691 has 2 divisors, whose sum is σ = 316661661692. Its totient is φ = 316661661690.

The previous prime is 316661661623. The next prime is 316661661709. The reversal of 316661661691 is 196166166613.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 316661661691 - 2⁹ = 316661661179 is a prime.

It is not a weakly prime, because it can be changed into another prime (316661661611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158330830845 + 158330830846.

It is an arithmetic number, because the mean of its divisors is an integer number (158330830846).

Almost surely, 2^316661661691 is an apocalyptic number.

316661661691 is a deficient number, since it is larger than the sum of its proper divisors (1).

316661661691 is an equidigital number, since it uses as much as digits as its factorization.

316661661691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1259712, while the sum is 52.

The spelling of 316661661691 in words is "three hundred sixteen billion, six hundred sixty-one million, six hundred sixty-one thousand, six hundred ninety-one".