666675729 has 12 divisors (see below), whose sum is σ = 976540032. Its totient is φ = 438190200.

The previous prime is 666675727. The next prime is 666675761. The reversal of 666675729 is 927576666.

666675729 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 666675729 - 2¹ = 666675727 is a prime.

It is not an unprimeable number, because it can be changed into a prime (666675727) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 521017 + ... + 522294.

It is an arithmetic number, because the mean of its divisors is an integer number (81378336).

Almost surely, 2^666675729 is an apocalyptic number.

It is an amenable number.

666675729 is a deficient number, since it is larger than the sum of its proper divisors (309864303).

666675729 is a wasteful number, since it uses less digits than its factorization.

666675729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1043388 (or 1043385 counting only the distinct ones).

The product of its digits is 5715360, while the sum is 54.

The square root of 666675729 is about 25820.0644654501. The cubic root of 666675729 is about 873.5844230570.

The spelling of 666675729 in words is "six hundred sixty-six million, six hundred seventy-five thousand, seven hundred twenty-nine".