668458179496 has 8 divisors (see below), whose sum is σ = 1253359086570. Its totient is φ = 334229089744.

The previous prime is 668458179469. The next prime is 668458179503. The reversal of 668458179496 is 694971854866.

It can be written as a sum of positive squares in only one way, i.e., 664273900900 + 4184278596 = 815030^2 + 64686^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41778636211 + ... + 41778636226.

Almost surely, 2^668458179496 is an apocalyptic number.

It is an amenable number.

668458179496 is a deficient number, since it is larger than the sum of its proper divisors (584900907074).

668458179496 is a wasteful number, since it uses less digits than its factorization.

668458179496 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83557272443 (or 83557272439 counting only the distinct ones).

The product of its digits is 627056640, while the sum is 73.

The spelling of 668458179496 in words is "six hundred sixty-eight billion, four hundred fifty-eight million, one hundred seventy-nine thousand, four hundred ninety-six".