668984177 has 2 divisors, whose sum is σ = 668984178. Its totient is φ = 668984176.

The previous prime is 668984159. The next prime is 668984207. The reversal of 668984177 is 771489866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 370524001 + 298460176 = 19249^2 + 17276^2 .

It is a cyclic number.

It is not a de Polignac number, because 668984177 - 2¹⁶ = 668918641 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (668984117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334492088 + 334492089.

It is an arithmetic number, because the mean of its divisors is an integer number (334492089).

Almost surely, 2^668984177 is an apocalyptic number.

It is an amenable number.

668984177 is a deficient number, since it is larger than the sum of its proper divisors (1).

668984177 is an equidigital number, since it uses as much as digits as its factorization.

668984177 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4064256, while the sum is 56.

The square root of 668984177 is about 25864.7284346849. The cubic root of 668984177 is about 874.5915599051.

The spelling of 668984177 in words is "six hundred sixty-eight million, nine hundred eighty-four thousand, one hundred seventy-seven".