668873479 has 4 divisors (see below), whose sum is σ = 679838680. Its totient is φ = 657908280.

The previous prime is 668873423. The next prime is 668873519. The reversal of 668873479 is 974378866.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 668873479 - 2⁷ = 668873351 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668870479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5482509 + ... + 5482630.

It is an arithmetic number, because the mean of its divisors is an integer number (169959670).

Almost surely, 2^668873479 is an apocalyptic number.

668873479 is a deficient number, since it is larger than the sum of its proper divisors (10965201).

668873479 is a wasteful number, since it uses less digits than its factorization.

668873479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10965200.

The product of its digits is 12192768, while the sum is 58.

The square root of 668873479 is about 25862.5884048755. The cubic root of 668873479 is about 874.5433171711.

The spelling of 668873479 in words is "six hundred sixty-eight million, eight hundred seventy-three thousand, four hundred seventy-nine".