316616454221 has 2 divisors, whose sum is σ = 316616454222. Its totient is φ = 316616454220.

The previous prime is 316616454197. The next prime is 316616454227. The reversal of 316616454221 is 122454616613.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 276960112900 + 39656341321 = 526270^2 + 199139^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-316616454221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (316616454227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158308227110 + 158308227111.

It is an arithmetic number, because the mean of its divisors is an integer number (158308227111).

Almost surely, 2^316616454221 is an apocalyptic number.

It is an amenable number.

316616454221 is a deficient number, since it is larger than the sum of its proper divisors (1).

316616454221 is an equidigital number, since it uses as much as digits as its factorization.

316616454221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 207360, while the sum is 41.

The spelling of 316616454221 in words is "three hundred sixteen billion, six hundred sixteen million, four hundred fifty-four thousand, two hundred twenty-one".