666965802164 has 6 divisors (see below), whose sum is σ = 1167190153794. Its totient is φ = 333482901080.

The previous prime is 666965802163. The next prime is 666965802179. The reversal of 666965802164 is 461208569666.

It can be written as a sum of positive squares in only one way, i.e., 652201608100 + 14764194064 = 807590^2 + 121508^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666965802163) 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, 83370725267 + ... + 83370725274.

It is an arithmetic number, because the mean of its divisors is an integer number (194531692299).

Almost surely, 2^666965802164 is an apocalyptic number.

It is an amenable number.

666965802164 is a deficient number, since it is larger than the sum of its proper divisors (500224351630).

666965802164 is a wasteful number, since it uses less digits than its factorization.

666965802164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166741450545 (or 166741450543 counting only the distinct ones).

The product of its (nonzero) digits is 22394880, while the sum is 59.

The spelling of 666965802164 in words is "six hundred sixty-six billion, nine hundred sixty-five million, eight hundred two thousand, one hundred sixty-four".