316616643221 has 2 divisors, whose sum is σ = 316616643222. Its totient is φ = 316616643220.

The previous prime is 316616643179. The next prime is 316616643251. The reversal of 316616643221 is 122346616613.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 226833112900 + 89783530321 = 476270^2 + 299639^2 .

It is a cyclic number.

It is not a de Polignac number, because 316616643221 - 2³⁴ = 299436774037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (316616643251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158308321610 + 158308321611.

It is an arithmetic number, because the mean of its divisors is an integer number (158308321611).

Almost surely, 2^316616643221 is an apocalyptic number.

It is an amenable number.

316616643221 is a deficient number, since it is larger than the sum of its proper divisors (1).

316616643221 is an equidigital number, since it uses as much as digits as its factorization.

316616643221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624, while the sum is 41.

The spelling of 316616643221 in words is "three hundred sixteen billion, six hundred sixteen million, six hundred forty-three thousand, two hundred twenty-one".