668237077 has 2 divisors, whose sum is σ = 668237078. Its totient is φ = 668237076.

The previous prime is 668237047. The next prime is 668237083. The reversal of 668237077 is 770732866.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 597020356 + 71216721 = 24434^2 + 8439^2 .

It is a cyclic number.

It is not a de Polignac number, because 668237077 - 2²⁷ = 534019349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668237047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334118538 + 334118539.

It is an arithmetic number, because the mean of its divisors is an integer number (334118539).

Almost surely, 2^668237077 is an apocalyptic number.

It is an amenable number.

668237077 is a deficient number, since it is larger than the sum of its proper divisors (1).

668237077 is an equidigital number, since it uses as much as digits as its factorization.

668237077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 592704, while the sum is 46.

The square root of 668237077 is about 25850.2819520407. The cubic root of 668237077 is about 874.2658667309.

The spelling of 668237077 in words is "six hundred sixty-eight million, two hundred thirty-seven thousand, seventy-seven".