668512771 has 2 divisors, whose sum is σ = 668512772. Its totient is φ = 668512770.

The previous prime is 668512759. The next prime is 668512807. The reversal of 668512771 is 177215866.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 668512771 - 2⁷ = 668512643 is a prime.

It is not a weakly prime, because it can be changed into another prime (668512711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334256385 + 334256386.

It is an arithmetic number, because the mean of its divisors is an integer number (334256386).

Almost surely, 2^668512771 is an apocalyptic number.

668512771 is a deficient number, since it is larger than the sum of its proper divisors (1).

668512771 is an equidigital number, since it uses as much as digits as its factorization.

668512771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 141120, while the sum is 43.

The square root of 668512771 is about 25855.6139165172. The cubic root of 668512771 is about 874.3860819073.

The spelling of 668512771 in words is "six hundred sixty-eight million, five hundred twelve thousand, seven hundred seventy-one".