668432771 has 4 divisors (see below), whose sum is σ = 679762200. Its totient is φ = 657103344.

The previous prime is 668432747. The next prime is 668432773. The reversal of 668432771 is 177234866.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 177234866 = 2 ⋅88617433.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-668432771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668432773) 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, 5664626 + ... + 5664743.

It is an arithmetic number, because the mean of its divisors is an integer number (169940550).

Almost surely, 2^668432771 is an apocalyptic number.

668432771 is a deficient number, since it is larger than the sum of its proper divisors (11329429).

668432771 is a wasteful number, since it uses less digits than its factorization.

668432771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11329428.

The product of its digits is 338688, while the sum is 44.

The square root of 668432771 is about 25854.0668174274. The cubic root of 668432771 is about 874.3512016577.

The spelling of 668432771 in words is "six hundred sixty-eight million, four hundred thirty-two thousand, seven hundred seventy-one".