668972977813 has 16 divisors (see below), whose sum is σ = 783220322304. Its totient is φ = 559396736640.

The previous prime is 668972977801. The next prime is 668972977819. The reversal of 668972977813 is 318779279866.

It is not a de Polignac number, because 668972977813 - 2²⁵ = 668939423381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668972977819) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13693356 + ... + 13742122.

It is an arithmetic number, because the mean of its divisors is an integer number (48951270144).

Almost surely, 2^668972977813 is an apocalyptic number.

It is an amenable number.

668972977813 is a deficient number, since it is larger than the sum of its proper divisors (114247344491).

668972977813 is a wasteful number, since it uses less digits than its factorization.

668972977813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96612.

The product of its digits is 384072192, while the sum is 73.

The spelling of 668972977813 in words is "six hundred sixty-eight billion, nine hundred seventy-two million, nine hundred seventy-seven thousand, eight hundred thirteen".