168268451813 has 12 divisors (see below), whose sum is σ = 213535475712. Its totient is φ = 131118273720.

The previous prime is 168268451809. The next prime is 168268451863. The reversal of 168268451813 is 318154862861.

It is not a de Polignac number, because 168268451813 - 2² = 168268451809 is a prime.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168268451863) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 156092645 + ... + 156093722.

It is an arithmetic number, because the mean of its divisors is an integer number (17794622976).

Almost surely, 2^168268451813 is an apocalyptic number.

It is an amenable number.

168268451813 is a deficient number, since it is larger than the sum of its proper divisors (45267023899).

168268451813 is a wasteful number, since it uses less digits than its factorization.

168268451813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312186392 (or 312186385 counting only the distinct ones).

The product of its digits is 2211840, while the sum is 53.

The spelling of 168268451813 in words is "one hundred sixty-eight billion, two hundred sixty-eight million, four hundred fifty-one thousand, eight hundred thirteen".