668774479 has 2 divisors, whose sum is σ = 668774480. Its totient is φ = 668774478.

The previous prime is 668774459. The next prime is 668774497. The reversal of 668774479 is 974477866.

Together with next prime (668774497) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 668774479 - 2²³ = 660385871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668774419) 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, 334387239 + 334387240.

It is an arithmetic number, because the mean of its divisors is an integer number (334387240).

Almost surely, 2^668774479 is an apocalyptic number.

668774479 is a deficient number, since it is larger than the sum of its proper divisors (1).

668774479 is an equidigital number, since it uses as much as digits as its factorization.

668774479 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14224896, while the sum is 58.

The square root of 668774479 is about 25860.6743724908. The cubic root of 668774479 is about 874.5001679742.

The spelling of 668774479 in words is "six hundred sixty-eight million, seven hundred seventy-four thousand, four hundred seventy-nine".