216446566313 has 2 divisors, whose sum is σ = 216446566314. Its totient is φ = 216446566312.

The previous prime is 216446566247. The next prime is 216446566321. The reversal of 216446566313 is 313665644612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 185854107664 + 30592458649 = 431108^2 + 174907^2 .

It is a cyclic number.

It is not a de Polignac number, because 216446566313 - 2⁸ = 216446566057 is a prime.

It is not a weakly prime, because it can be changed into another prime (216446562313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108223283156 + 108223283157.

It is an arithmetic number, because the mean of its divisors is an integer number (108223283157).

Almost surely, 2^216446566313 is an apocalyptic number.

It is an amenable number.

216446566313 is a deficient number, since it is larger than the sum of its proper divisors (1).

216446566313 is an equidigital number, since it uses as much as digits as its factorization.

216446566313 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1866240, while the sum is 47.

The spelling of 216446566313 in words is "two hundred sixteen billion, four hundred forty-six million, five hundred sixty-six thousand, three hundred thirteen".