668194364 has 6 divisors (see below), whose sum is σ = 1169340144. Its totient is φ = 334097180.

The previous prime is 668194363. The next prime is 668194381. The reversal of 668194364 is 463491866.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668194363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83524292 + ... + 83524299.

It is an arithmetic number, because the mean of its divisors is an integer number (194890024).

Almost surely, 2^668194364 is an apocalyptic number.

It is an amenable number.

668194364 is a deficient number, since it is larger than the sum of its proper divisors (501145780).

668194364 is a wasteful number, since it uses less digits than its factorization.

668194364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167048595 (or 167048593 counting only the distinct ones).

The product of its digits is 746496, while the sum is 47.

The square root of 668194364 is about 25849.4557776368. The cubic root of 668194364 is about 874.2472389540.

The spelling of 668194364 in words is "six hundred sixty-eight million, one hundred ninety-four thousand, three hundred sixty-four".