666333375 has 72 divisors (see below), whose sum is σ = 1172963376. Its totient is φ = 335916000.

The previous prime is 666333359. The next prime is 666333383. The reversal of 666333375 is 573333666.

It is not a de Polignac number, because 666333375 - 2⁴ = 666333359 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 15496104 + ... + 15496146.

It is an arithmetic number, because the mean of its divisors is an integer number (16291158).

Almost surely, 2^666333375 is an apocalyptic number.

666333375 is a deficient number, since it is larger than the sum of its proper divisors (506630001).

666333375 is an equidigital number, since it uses as much as digits as its factorization.

666333375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166 (or 82 counting only the distinct ones).

The product of its digits is 612360, while the sum is 42.

The square root of 666333375 is about 25813.4340024724. The cubic root of 666333375 is about 873.4348619250.

The spelling of 666333375 in words is "six hundred sixty-six million, three hundred thirty-three thousand, three hundred seventy-five".