666023889 has 16 divisors (see below), whose sum is σ = 924174720. Its totient is φ = 426128640.

The previous prime is 666023881. The next prime is 666023923. The reversal of 666023889 is 988320666.

It is not a de Polignac number, because 666023889 - 2³ = 666023881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (666023881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8392 + ... + 37449.

It is an arithmetic number, because the mean of its divisors is an integer number (57760920).

Almost surely, 2^666023889 is an apocalyptic number.

It is an amenable number.

666023889 is a deficient number, since it is larger than the sum of its proper divisors (258150831).

666023889 is a wasteful number, since it uses less digits than its factorization.

666023889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46040.

The product of its (nonzero) digits is 746496, while the sum is 48.

The square root of 666023889 is about 25807.4386369512. The cubic root of 666023889 is about 873.2996154487.

The spelling of 666023889 in words is "six hundred sixty-six million, twenty-three thousand, eight hundred eighty-nine".