668368971 has 12 divisors (see below), whose sum is σ = 965902600. Its totient is φ = 445357440.

The previous prime is 668368969. The next prime is 668368979. The reversal of 668368971 is 179863866.

It is a happy number.

It is not a de Polignac number, because 668368971 - 2¹ = 668368969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668368979) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1755 + ... + 36603.

Almost surely, 2^668368971 is an apocalyptic number.

668368971 is a deficient number, since it is larger than the sum of its proper divisors (297533629).

668368971 is a wasteful number, since it uses less digits than its factorization.

668368971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36986 (or 36983 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 54.

The square root of 668368971 is about 25852.8329395446. The cubic root of 668368971 is about 874.3233826638.

The spelling of 668368971 in words is "six hundred sixty-eight million, three hundred sixty-eight thousand, nine hundred seventy-one".