666738712 has 16 divisors (see below), whose sum is σ = 1253197800. Its totient is φ = 332552640.

The previous prime is 666738647. The next prime is 666738719. The reversal of 666738712 is 217837666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666738719) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98614 + ... + 105157.

Almost surely, 2^666738712 is an apocalyptic number.

It is an amenable number.

666738712 is a deficient number, since it is larger than the sum of its proper divisors (586459088).

666738712 is a wasteful number, since it uses less digits than its factorization.

666738712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204186 (or 204182 counting only the distinct ones).

The product of its digits is 508032, while the sum is 46.

The square root of 666738712 is about 25821.2840889062. The cubic root of 666738712 is about 873.6119323007.

The spelling of 666738712 in words is "six hundred sixty-six million, seven hundred thirty-eight thousand, seven hundred twelve".