666366152123 has 20 divisors (see below), whose sum is σ = 777488717808. Its totient is φ = 571091789520.

The previous prime is 666366152113. The next prime is 666366152161. The reversal of 666366152123 is 321251663666.

666366152123 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 666366152123 - 2¹⁶ = 666366086587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666366152113) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 23066378 + ... + 23095248.

Almost surely, 2^666366152123 is an apocalyptic number.

666366152123 is a deficient number, since it is larger than the sum of its proper divisors (111122565685).

666366152123 is an frugal number, since it uses more digits than its factorization.

666366152123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38512 (or 38491 counting only the distinct ones).

The product of its digits is 1399680, while the sum is 47.

The spelling of 666366152123 in words is "six hundred sixty-six billion, three hundred sixty-six million, one hundred fifty-two thousand, one hundred twenty-three".