664860354679 has 2 divisors, whose sum is σ = 664860354680. Its totient is φ = 664860354678.

The previous prime is 664860354583. The next prime is 664860354701. The reversal of 664860354679 is 976453068466.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 664860354679 - 2⁹ = 664860354167 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 664860354679.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664860354079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332430177339 + 332430177340.

It is an arithmetic number, because the mean of its divisors is an integer number (332430177340).

Almost surely, 2^664860354679 is an apocalyptic number.

664860354679 is a deficient number, since it is larger than the sum of its proper divisors (1).

664860354679 is an equidigital number, since it uses as much as digits as its factorization.

664860354679 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 156764160, while the sum is 64.

The spelling of 664860354679 in words is "six hundred sixty-four billion, eight hundred sixty million, three hundred fifty-four thousand, six hundred seventy-nine".