666975794 has 8 divisors (see below), whose sum is σ = 1001068140. Its totient is φ = 333286416.

The previous prime is 666975767. The next prime is 666975809. The reversal of 666975794 is 497579666.

It is a happy number.

666975794 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 563445169 + 103530625 = 23737^2 + 10175^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96569 + ... + 103244.

Almost surely, 2^666975794 is an apocalyptic number.

666975794 is a deficient number, since it is larger than the sum of its proper divisors (334092346).

666975794 is a wasteful number, since it uses less digits than its factorization.

666975794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201484.

The product of its digits is 17146080, while the sum is 59.

The square root of 666975794 is about 25825.8745060066. The cubic root of 666975794 is about 873.7154676717.

The spelling of 666975794 in words is "six hundred sixty-six million, nine hundred seventy-five thousand, seven hundred ninety-four".