666852490117 has 4 divisors (see below), whose sum is σ = 727475443776. Its totient is φ = 606229536460.

The previous prime is 666852490093. The next prime is 666852490127. The reversal of 666852490117 is 711094258666.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 666852490117 - 2²³ = 666844101509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666852490127) 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 in 3 ways as a sum of consecutive naturals, for example, 30311476813 + ... + 30311476834.

It is an arithmetic number, because the mean of its divisors is an integer number (181868860944).

Almost surely, 2^666852490117 is an apocalyptic number.

It is an amenable number.

666852490117 is a deficient number, since it is larger than the sum of its proper divisors (60622953659).

666852490117 is a wasteful number, since it uses less digits than its factorization.

666852490117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60622953658.

The product of its (nonzero) digits is 4354560, while the sum is 55.

The spelling of 666852490117 in words is "six hundred sixty-six billion, eight hundred fifty-two million, four hundred ninety thousand, one hundred seventeen".