664710364193 has 2 divisors, whose sum is σ = 664710364194. Its totient is φ = 664710364192.

The previous prime is 664710364147. The next prime is 664710364243. The reversal of 664710364193 is 391463017466.

It is an a-pointer prime, because the next prime (664710364243) can be obtained adding 664710364193 to its sum of digits (50).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 467354078689 + 197356285504 = 683633^2 + 444248^2 .

It is a cyclic number.

It is not a de Polignac number, because 664710364193 - 2¹⁶ = 664710298657 is a prime.

It is not a weakly prime, because it can be changed into another prime (664710364993) 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, 332355182096 + 332355182097.

It is an arithmetic number, because the mean of its divisors is an integer number (332355182097).

Almost surely, 2^664710364193 is an apocalyptic number.

It is an amenable number.

664710364193 is a deficient number, since it is larger than the sum of its proper divisors (1).

664710364193 is an equidigital number, since it uses as much as digits as its factorization.

664710364193 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1959552, while the sum is 50.

The spelling of 664710364193 in words is "six hundred sixty-four billion, seven hundred ten million, three hundred sixty-four thousand, one hundred ninety-three".