666991230 has 32 divisors (see below), whose sum is σ = 1644045984. Its totient is φ = 173056896.

The previous prime is 666991223. The next prime is 666991261. The reversal of 666991230 is 32199666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 299337 + ... + 301556.

It is an arithmetic number, because the mean of its divisors is an integer number (51376437).

Almost surely, 2^666991230 is an apocalyptic number.

666991230 is an abundant number, since it is smaller than the sum of its proper divisors (977054754).

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

666991230 is a wasteful number, since it uses less digits than its factorization.

666991230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 600940.

The product of its (nonzero) digits is 104976, while the sum is 42.

The square root of 666991230 is about 25826.1733518537. The cubic root of 666991230 is about 873.7222078303.

The spelling of 666991230 in words is "six hundred sixty-six million, nine hundred ninety-one thousand, two hundred thirty".