666663375 has 128 divisors (see below), whose sum is σ = 1329868800. Its totient is φ = 296352000.

The previous prime is 666663367. The next prime is 666663391. The reversal of 666663375 is 573366666.

It is not a de Polignac number, because 666663375 - 2³ = 666663367 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 9132339 + ... + 9132411.

It is an arithmetic number, because the mean of its divisors is an integer number (10389600).

Almost surely, 2^666663375 is an apocalyptic number.

666663375 is a deficient number, since it is larger than the sum of its proper divisors (663205425).

666663375 is an equidigital number, since it uses as much as digits as its factorization.

666663375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183 (or 159 counting only the distinct ones).

The product of its digits is 2449440, while the sum is 48.

The square root of 666663375 is about 25819.8252317865. The cubic root of 666663375 is about 873.5790269661.

The spelling of 666663375 in words is "six hundred sixty-six million, six hundred sixty-three thousand, three hundred seventy-five".