668613277 has 2 divisors, whose sum is σ = 668613278. Its totient is φ = 668613276.

The previous prime is 668613269. The next prime is 668613329. The reversal of 668613277 is 772316866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 646888356 + 21724921 = 25434^2 + 4661^2 .

It is a cyclic number.

It is not a de Polignac number, because 668613277 - 2³ = 668613269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668613227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334306638 + 334306639.

It is an arithmetic number, because the mean of its divisors is an integer number (334306639).

Almost surely, 2^668613277 is an apocalyptic number.

It is an amenable number.

668613277 is a deficient number, since it is larger than the sum of its proper divisors (1).

668613277 is an equidigital number, since it uses as much as digits as its factorization.

668613277 is an evil number, because the sum of its binary digits is even.

The product of its digits is 508032, while the sum is 46.

The square root of 668613277 is about 25857.5574445847. The cubic root of 668613277 is about 874.4298988931.

The spelling of 668613277 in words is "six hundred sixty-eight million, six hundred thirteen thousand, two hundred seventy-seven".