668494615311 has 12 divisors (see below), whose sum is σ = 998900000280. Its totient is φ = 430295384400.

The previous prime is 668494615309. The next prime is 668494615319. The reversal of 668494615311 is 113516494866.

668494615311 is a `hidden beast` number, since 6 + 6 + 8 + 4 + 9 + 4 + 615 + 3 + 11 = 666.

668494615311 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 668494615311 - 2¹ = 668494615309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668494615319) 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, 1280640765 + ... + 1280641286.

It is an arithmetic number, because the mean of its divisors is an integer number (83241666690).

Almost surely, 2^668494615311 is an apocalyptic number.

668494615311 is a deficient number, since it is larger than the sum of its proper divisors (330405384969).

668494615311 is a wasteful number, since it uses less digits than its factorization.

668494615311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2561282086 (or 2561282083 counting only the distinct ones).

The product of its digits is 3732480, while the sum is 54.

The spelling of 668494615311 in words is "six hundred sixty-eight billion, four hundred ninety-four million, six hundred fifteen thousand, three hundred eleven".