668894894 has 8 divisors (see below), whose sum is σ = 1004048760. Its totient is φ = 334211976.

The previous prime is 668894893. The next prime is 668894909. The reversal of 668894894 is 498498866.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668894893) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114164 + ... + 119879.

It is an arithmetic number, because the mean of its divisors is an integer number (125506095).

Almost surely, 2^668894894 is an apocalyptic number.

668894894 is a deficient number, since it is larger than the sum of its proper divisors (335153866).

668894894 is a wasteful number, since it uses less digits than its factorization.

668894894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235474.

The product of its digits is 23887872, while the sum is 62.

The square root of 668894894 is about 25863.0024165796. The cubic root of 668894894 is about 874.5526503489.

The spelling of 668894894 in words is "six hundred sixty-eight million, eight hundred ninety-four thousand, eight hundred ninety-four".