668380077 has 6 divisors (see below), whose sum is σ = 965437902. Its totient is φ = 445586712.

The previous prime is 668380039. The next prime is 668380087. The reversal of 668380077 is 770083866.

It can be written as a sum of positive squares in only one way, i.e., 525601476 + 142778601 = 22926^2 + 11949^2 .

It is not a de Polignac number, because 668380077 - 2²⁸ = 399944621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668380087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37132218 + ... + 37132235.

It is an arithmetic number, because the mean of its divisors is an integer number (160906317).

Almost surely, 2^668380077 is an apocalyptic number.

It is an amenable number.

668380077 is a deficient number, since it is larger than the sum of its proper divisors (297057825).

668380077 is a wasteful number, since it uses less digits than its factorization.

668380077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74264459 (or 74264456 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The square root of 668380077 is about 25853.0477313604. The cubic root of 668380077 is about 874.3282253889.

The spelling of 668380077 in words is "six hundred sixty-eight million, three hundred eighty thousand, seventy-seven".