666245317257 has 16 divisors (see below), whose sum is σ = 1062955492480. Its totient is φ = 409997118096.

The previous prime is 666245317229. The next prime is 666245317259. The reversal of 666245317257 is 752713542666.

It is not a de Polignac number, because 666245317257 - 2¹¹ = 666245315209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666245317259) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 949067053 + ... + 949067754.

It is an arithmetic number, because the mean of its divisors is an integer number (66434718280).

Almost surely, 2^666245317257 is an apocalyptic number.

It is an amenable number.

666245317257 is a deficient number, since it is larger than the sum of its proper divisors (396710175223).

666245317257 is a wasteful number, since it uses less digits than its factorization.

666245317257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1898134829 (or 1898134823 counting only the distinct ones).

The product of its digits is 12700800, while the sum is 54.

The spelling of 666245317257 in words is "six hundred sixty-six billion, two hundred forty-five million, three hundred seventeen thousand, two hundred fifty-seven".