666731612 has 12 divisors (see below), whose sum is σ = 1167050976. Its totient is φ = 333288480.

The previous prime is 666731599. The next prime is 666731617. The reversal of 666731612 is 216137666.

It is a happy number.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666731617) 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, 2912 + ... + 36632.

It is an arithmetic number, because the mean of its divisors is an integer number (97254248).

Almost surely, 2^666731612 is an apocalyptic number.

It is an amenable number.

666731612 is a deficient number, since it is larger than the sum of its proper divisors (500319364).

666731612 is a wasteful number, since it uses less digits than its factorization.

666731612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38668 (or 38666 counting only the distinct ones).

The product of its digits is 54432, while the sum is 38.

The square root of 666731612 is about 25821.1466050600. The cubic root of 666731612 is about 873.6088313024.

The spelling of 666731612 in words is "six hundred sixty-six million, seven hundred thirty-one thousand, six hundred twelve".