668888894 has 8 divisors (see below), whose sum is σ = 1003567008. Its totient is φ = 334366560.

The previous prime is 668888887. The next prime is 668888903. The reversal of 668888894 is 498888866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 668888894.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27542 + ... + 45785.

It is an arithmetic number, because the mean of its divisors is an integer number (125445876).

Almost surely, 2^668888894 is an apocalyptic number.

668888894 is a deficient number, since it is larger than the sum of its proper divisors (334678114).

668888894 is a wasteful number, since it uses less digits than its factorization.

668888894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77890.

The product of its digits is 42467328, while the sum is 65.

The square root of 668888894 is about 25862.8864205061. The cubic root of 668888894 is about 874.5500354230.

The spelling of 668888894 in words is "six hundred sixty-eight million, eight hundred eighty-eight thousand, eight hundred ninety-four".