168031815013 has 2 divisors, whose sum is σ = 168031815014. Its totient is φ = 168031815012.

The previous prime is 168031814983. The next prime is 168031815067. The reversal of 168031815013 is 310518130861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 105548313924 + 62483501089 = 324882^2 + 249967^2 .

It is a cyclic number.

It is not a de Polignac number, because 168031815013 - 2⁵ = 168031814981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168031815613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84015907506 + 84015907507.

It is an arithmetic number, because the mean of its divisors is an integer number (84015907507).

Almost surely, 2^168031815013 is an apocalyptic number.

It is an amenable number.

168031815013 is a deficient number, since it is larger than the sum of its proper divisors (1).

168031815013 is an equidigital number, since it uses as much as digits as its factorization.

168031815013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 37.

Adding to 168031815013 its reverse (310518130861), we get a palindrome (478549945874).

The spelling of 168031815013 in words is "one hundred sixty-eight billion, thirty-one million, eight hundred fifteen thousand, thirteen".