668598994 has 16 divisors (see below), whose sum is σ = 1147924800. Its totient is φ = 286103664.

The previous prime is 668598971. The next prime is 668599003. The reversal of 668598994 is 499895866.

It is a super-2 number, since 2×668598994² = 894049229555624072, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27009 + ... + 45460.

It is an arithmetic number, because the mean of its divisors is an integer number (71745300).

Almost surely, 2^668598994 is an apocalyptic number.

668598994 is a deficient number, since it is larger than the sum of its proper divisors (479325806).

668598994 is a wasteful number, since it uses less digits than its factorization.

668598994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73137.

The product of its digits is 33592320, while the sum is 64.

The square root of 668598994 is about 25857.2812569303. The cubic root of 668598994 is about 874.4236722887.

The spelling of 668598994 in words is "six hundred sixty-eight million, five hundred ninety-eight thousand, nine hundred ninety-four".