666426123 has 20 divisors (see below), whose sum is σ = 1086029208. Its totient is φ = 403894080.

The previous prime is 666426107. The next prime is 666426143. The reversal of 666426123 is 321624666.

It is not a de Polignac number, because 666426123 - 2⁴ = 666426107 is a prime.

It is a super-2 number, since 2×666426123² = 888247554833622258, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (666426143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 373086 + ... + 374867.

Almost surely, 2^666426123 is an apocalyptic number.

666426123 is a deficient number, since it is larger than the sum of its proper divisors (419603085).

666426123 is a wasteful number, since it uses less digits than its factorization.

666426123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 747976 (or 747967 counting only the distinct ones).

The product of its digits is 62208, while the sum is 36.

The square root of 666426123 is about 25815.2304463857. The cubic root of 666426123 is about 873.4753849731.

The spelling of 666426123 in words is "six hundred sixty-six million, four hundred twenty-six thousand, one hundred twenty-three".