664860874973 has 2 divisors, whose sum is σ = 664860874974. Its totient is φ = 664860874972.

The previous prime is 664860874967. The next prime is 664860874981. The reversal of 664860874973 is 379478068466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 622145492644 + 42715382329 = 788762^2 + 206677^2 .

It is a cyclic number.

It is not a de Polignac number, because 664860874973 - 2⁴ = 664860874957 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664860874933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332430437486 + 332430437487.

It is an arithmetic number, because the mean of its divisors is an integer number (332430437487).

Almost surely, 2^664860874973 is an apocalyptic number.

It is an amenable number.

664860874973 is a deficient number, since it is larger than the sum of its proper divisors (1).

664860874973 is an equidigital number, since it uses as much as digits as its factorization.

664860874973 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 292626432, while the sum is 68.

The spelling of 664860874973 in words is "six hundred sixty-four billion, eight hundred sixty million, eight hundred seventy-four thousand, nine hundred seventy-three".