668346937 has 2 divisors, whose sum is σ = 668346938. Its totient is φ = 668346936.

The previous prime is 668346929. The next prime is 668346941. The reversal of 668346937 is 739643866.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 406586896 + 261760041 = 20164^2 + 16179^2 .

It is a cyclic number.

It is not a de Polignac number, because 668346937 - 2³ = 668346929 is a prime.

It is not a weakly prime, because it can be changed into another prime (668346037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334173468 + 334173469.

It is an arithmetic number, because the mean of its divisors is an integer number (334173469).

Almost surely, 2^668346937 is an apocalyptic number.

It is an amenable number.

668346937 is a deficient number, since it is larger than the sum of its proper divisors (1).

668346937 is an equidigital number, since it uses as much as digits as its factorization.

668346937 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3919104, while the sum is 52.

The square root of 668346937 is about 25852.4067931789. The cubic root of 668346937 is about 874.3137746708.

The spelling of 668346937 in words is "six hundred sixty-eight million, three hundred forty-six thousand, nine hundred thirty-seven".