665166203133633 has 6 divisors (see below), whose sum is σ = 960795626748594. Its totient is φ = 443444135422416.

The previous prime is 665166203133599. The next prime is 665166203133643. The reversal of 665166203133633 is 336331302661566.

665166203133633 is a `hidden beast` number, since 6 + 6 + 5 + 1 + 6 + 620 + 3 + 1 + 3 + 3 + 6 + 3 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 463491468437904 + 201674734695729 = 21528852^2 + 14201223^2 .

It is not a de Polignac number, because 665166203133633 - 2⁶ = 665166203133569 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 665166203133633.

It is not an unprimeable number, because it can be changed into a prime (665166203133643) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36953677951860 + ... + 36953677951877.

It is an arithmetic number, because the mean of its divisors is an integer number (160132604458099).

Almost surely, 2^{665166203133633} is an apocalyptic number.

It is an amenable number.

665166203133633 is a deficient number, since it is larger than the sum of its proper divisors (295629423614961).

665166203133633 is a wasteful number, since it uses less digits than its factorization.

665166203133633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73907355903743 (or 73907355903740 counting only the distinct ones).

The product of its (nonzero) digits is 18895680, while the sum is 54.

The spelling of 665166203133633 in words is "six hundred sixty-five trillion, one hundred sixty-six billion, two hundred three million, one hundred thirty-three thousand, six hundred thirty-three".