666111123 has 6 divisors (see below), whose sum is σ = 962160524. Its totient is φ = 444074076.

The previous prime is 666111113. The next prime is 666111169. The reversal of 666111123 is 321111666.

It is not a de Polignac number, because 666111123 - 2⁴ = 666111107 is a prime.

It is a super-2 number, since 2×666111123² = 887408056368642258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666111113) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37006165 + ... + 37006182.

Almost surely, 2^666111123 is an apocalyptic number.

666111123 is a deficient number, since it is larger than the sum of its proper divisors (296049401).

666111123 is a wasteful number, since it uses less digits than its factorization.

666111123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74012353 (or 74012350 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 666111123 is about 25809.1286757225. The cubic root of 666111123 is about 873.3377412548.

Adding to 666111123 its reverse (321111666), we get a palindrome (987222789).

The spelling of 666111123 in words is "six hundred sixty-six million, one hundred eleven thousand, one hundred twenty-three".