668505505239 has 32 divisors (see below), whose sum is σ = 1163521632000. Its totient is φ = 373989091680.

The previous prime is 668505505231. The next prime is 668505505247. The reversal of 668505505239 is 932505505866.

668505505239 is a `hidden beast` number, since 6 + 6 + 8 + 5 + 0 + 550 + 52 + 39 = 666.

It is an interprime number because it is at equal distance from previous prime (668505505231) and next prime (668505505247).

It is not a de Polignac number, because 668505505239 - 2³ = 668505505231 is a prime.

It is a super-2 number, since 2×668505505239² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668505505231) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 86567689 + ... + 86575410.

It is an arithmetic number, because the mean of its divisors is an integer number (36360051000).

Almost surely, 2^668505505239 is an apocalyptic number.

668505505239 is a deficient number, since it is larger than the sum of its proper divisors (495016126761).

668505505239 is a wasteful number, since it uses less digits than its factorization.

668505505239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173143132 (or 173143126 counting only the distinct ones).

The product of its (nonzero) digits is 9720000, while the sum is 54.

The spelling of 668505505239 in words is "six hundred sixty-eight billion, five hundred five million, five hundred five thousand, two hundred thirty-nine".