664801623313 has 2 divisors, whose sum is σ = 664801623314. Its totient is φ = 664801623312.

The previous prime is 664801623251. The next prime is 664801623319. The reversal of 664801623313 is 313326108466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 646041390289 + 18760233024 = 803767^2 + 136968^2 .

It is a cyclic number.

It is not a de Polignac number, because 664801623313 - 2¹⁷ = 664801492241 is a prime.

It is a super-2 number, since 2×664801623313² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 664801623313.

It is not a weakly prime, because it can be changed into another prime (664801623319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332400811656 + 332400811657.

It is an arithmetic number, because the mean of its divisors is an integer number (332400811657).

Almost surely, 2^664801623313 is an apocalyptic number.

It is an amenable number.

664801623313 is a deficient number, since it is larger than the sum of its proper divisors (1).

664801623313 is an equidigital number, since it uses as much as digits as its factorization.

664801623313 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 373248, while the sum is 43.

The spelling of 664801623313 in words is "six hundred sixty-four billion, eight hundred one million, six hundred twenty-three thousand, three hundred thirteen".