666731752 has 32 divisors (see below), whose sum is σ = 1268654400. Its totient is φ = 328451200.

The previous prime is 666731729. The next prime is 666731761. The reversal of 666731752 is 257137666.

It is a junction number, because it is equal to n+sod(n) for n = 666731699 and 666731708.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 219927 + ... + 222937.

It is an arithmetic number, because the mean of its divisors is an integer number (39645450).

Almost surely, 2^666731752 is an apocalyptic number.

It is an amenable number.

666731752 is a deficient number, since it is larger than the sum of its proper divisors (601922648).

666731752 is a wasteful number, since it uses less digits than its factorization.

666731752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3417 (or 3413 counting only the distinct ones).

The product of its digits is 317520, while the sum is 43.

The square root of 666731752 is about 25821.1493160161. The cubic root of 666731752 is about 873.6088924491.

The spelling of 666731752 in words is "six hundred sixty-six million, seven hundred thirty-one thousand, seven hundred fifty-two".