668514439 has 2 divisors, whose sum is σ = 668514440. Its totient is φ = 668514438.

The previous prime is 668514391. The next prime is 668514463. The reversal of 668514439 is 934415866.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 668514439 - 2⁹ = 668513927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668514499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334257219 + 334257220.

It is an arithmetic number, because the mean of its divisors is an integer number (334257220).

Almost surely, 2^668514439 is an apocalyptic number.

668514439 is a deficient number, since it is larger than the sum of its proper divisors (1).

668514439 is an equidigital number, since it uses as much as digits as its factorization.

668514439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 622080, while the sum is 46.

The square root of 668514439 is about 25855.6461725481. The cubic root of 668514439 is about 874.3868091309.

The spelling of 668514439 in words is "six hundred sixty-eight million, five hundred fourteen thousand, four hundred thirty-nine".