666677890123 has 12 divisors (see below), whose sum is σ = 776780221032. Its totient is φ = 570512009760.

The previous prime is 666677890093. The next prime is 666677890141. The reversal of 666677890123 is 321098776666.

It is not a de Polignac number, because 666677890123 - 2⁵ = 666677890091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666677800123) 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 11 ways as a sum of consecutive naturals, for example, 10995433 + ... + 11055898.

It is an arithmetic number, because the mean of its divisors is an integer number (64731685086).

Almost surely, 2^666677890123 is an apocalyptic number.

666677890123 is a deficient number, since it is larger than the sum of its proper divisors (110102330909).

666677890123 is a wasteful number, since it uses less digits than its factorization.

666677890123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22051962 (or 22051955 counting only the distinct ones).

The product of its (nonzero) digits is 27433728, while the sum is 61.

The spelling of 666677890123 in words is "six hundred sixty-six billion, six hundred seventy-seven million, eight hundred ninety thousand, one hundred twenty-three".