668351997179 has 2 divisors, whose sum is σ = 668351997180. Its totient is φ = 668351997178.

The previous prime is 668351997161. The next prime is 668351997193. The reversal of 668351997179 is 971799153866.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 668351997179 - 2¹² = 668351993083 is a prime.

It is not a weakly prime, because it can be changed into another prime (668351997199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334175998589 + 334175998590.

It is an arithmetic number, because the mean of its divisors is an integer number (334175998590).

Almost surely, 2^668351997179 is an apocalyptic number.

668351997179 is a deficient number, since it is larger than the sum of its proper divisors (1).

668351997179 is an equidigital number, since it uses as much as digits as its factorization.

668351997179 is an evil number, because the sum of its binary digits is even.

The product of its digits is 154314720, while the sum is 71.

The spelling of 668351997179 in words is "six hundred sixty-eight billion, three hundred fifty-one million, nine hundred ninety-seven thousand, one hundred seventy-nine".