666683712 has 42 divisors (see below), whose sum is σ = 1910930138. Its totient is φ = 222227712.

The previous prime is 666683623. The next prime is 666683783. The reversal of 666683712 is 217386666.

It can be written as a sum of positive squares in only one way, i.e., 609892416 + 56791296 = 24696^2 + 7536^2 .

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, 578143 + ... + 579294.

Almost surely, 2^666683712 is an apocalyptic number.

It is an amenable number.

666683712 is an abundant number, since it is smaller than the sum of its proper divisors (1244246426).

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

666683712 is a wasteful number, since it uses less digits than its factorization.

666683712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1157455 (or 1157442 counting only the distinct ones).

The product of its digits is 435456, while the sum is 45.

The square root of 666683712 is about 25820.2190540669. The cubic root of 666683712 is about 873.5879099080.

The spelling of 666683712 in words is "six hundred sixty-six million, six hundred eighty-three thousand, seven hundred twelve".