666720112 has 20 divisors (see below), whose sum is σ = 1299510576. Its totient is φ = 331362560.

The previous prime is 666720101. The next prime is 666720137. The reversal of 666720112 is 211027666.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122089 + ... + 127432.

Almost surely, 2^666720112 is an apocalyptic number.

It is an amenable number.

666720112 is a deficient number, since it is larger than the sum of its proper divisors (632790464).

666720112 is a wasteful number, since it uses less digits than its factorization.

666720112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249696 (or 249690 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 666720112 is about 25820.9239184038. The cubic root of 666720112 is about 873.6038085121.

Adding to 666720112 its reverse (211027666), we get a palindrome (877747778).

The spelling of 666720112 in words is "six hundred sixty-six million, seven hundred twenty thousand, one hundred twelve".