666670775 has 12 divisors (see below), whose sum is σ = 826993200. Its totient is φ = 533129280.

The previous prime is 666670757. The next prime is 666670777. The reversal of 666670775 is 577076666.

It is not a de Polignac number, because 666670775 - 2⁸ = 666670519 is a prime.

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666670777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 115406 + ... + 121044.

It is an arithmetic number, because the mean of its divisors is an integer number (68916100).

Almost surely, 2^666670775 is an apocalyptic number.

666670775 is a deficient number, since it is larger than the sum of its proper divisors (160322425).

666670775 is a wasteful number, since it uses less digits than its factorization.

666670775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10378 (or 10373 counting only the distinct ones).

The product of its (nonzero) digits is 2222640, while the sum is 50.

The square root of 666670775 is about 25819.9685321264. The cubic root of 666670775 is about 873.5822592125.

The spelling of 666670775 in words is "six hundred sixty-six million, six hundred seventy thousand, seven hundred seventy-five".