668188716 has 24 divisors (see below), whose sum is σ = 1679038704. Its totient is φ = 205596480.

The previous prime is 668188699. The next prime is 668188727. The reversal of 668188716 is 617881866.

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, 2141475 + ... + 2141786.

It is an arithmetic number, because the mean of its divisors is an integer number (69959946).

Almost surely, 2^668188716 is an apocalyptic number.

It is an amenable number.

668188716 is an abundant number, since it is smaller than the sum of its proper divisors (1010849988).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

668188716 is a wasteful number, since it uses less digits than its factorization.

668188716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4283281 (or 4283279 counting only the distinct ones).

The product of its digits is 774144, while the sum is 51.

The square root of 668188716 is about 25849.3465294580. The cubic root of 668188716 is about 874.2447757174.

The spelling of 668188716 in words is "six hundred sixty-eight million, one hundred eighty-eight thousand, seven hundred sixteen".