666572238 has 12 divisors (see below), whose sum is σ = 1444239888. Its totient is φ = 222190740.

The previous prime is 666572171. The next prime is 666572251. The reversal of 666572238 is 832275666.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 666572193 and 666572202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18515878 + ... + 18515913.

It is an arithmetic number, because the mean of its divisors is an integer number (120353324).

Almost surely, 2^666572238 is an apocalyptic number.

666572238 is an abundant number, since it is smaller than the sum of its proper divisors (777667650).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

666572238 is a wasteful number, since it uses less digits than its factorization.

666572238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37031799 (or 37031796 counting only the distinct ones).

The product of its digits is 725760, while the sum is 45.

The square root of 666572238 is about 25818.0603066923. The cubic root of 666572238 is about 873.5392172695.

The spelling of 666572238 in words is "six hundred sixty-six million, five hundred seventy-two thousand, two hundred thirty-eight".