668348479 has 2 divisors, whose sum is σ = 668348480. Its totient is φ = 668348478.

The previous prime is 668348431. The next prime is 668348491. The reversal of 668348479 is 974843866.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-668348479 is a prime.

It is a super-2 number, since 2×668348479² = 893379378763226882, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668340479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334174239 + 334174240.

It is an arithmetic number, because the mean of its divisors is an integer number (334174240).

Almost surely, 2^668348479 is an apocalyptic number.

668348479 is a deficient number, since it is larger than the sum of its proper divisors (1).

668348479 is an equidigital number, since it uses as much as digits as its factorization.

668348479 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6967296, while the sum is 55.

The square root of 668348479 is about 25852.4366163037. The cubic root of 668348479 is about 874.3144470715.

The spelling of 668348479 in words is "six hundred sixty-eight million, three hundred forty-eight thousand, four hundred seventy-nine".