668894577715 has 64 divisors (see below), whose sum is σ = 994500864000. Its totient is φ = 420568879104.

The previous prime is 668894577683. The next prime is 668894577721. The reversal of 668894577715 is 517775498866.

It is a cyclic number.

It is not a de Polignac number, because 668894577715 - 2⁵ = 668894577683 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 58214691 + ... + 58226179.

It is an arithmetic number, because the mean of its divisors is an integer number (15539076000).

Almost surely, 2^668894577715 is an apocalyptic number.

668894577715 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

668894577715 is a deficient number, since it is larger than the sum of its proper divisors (325606286285).

668894577715 is a wasteful number, since it uses less digits than its factorization.

668894577715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12356.

The product of its digits is 711244800, while the sum is 73.

The spelling of 668894577715 in words is "six hundred sixty-eight billion, eight hundred ninety-four million, five hundred seventy-seven thousand, seven hundred fifteen".