666906833 has 8 divisors (see below), whose sum is σ = 686097600. Its totient is φ = 647777520.

The previous prime is 666906809. The next prime is 666906847. The reversal of 666906833 is 338609666.

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

It is a cyclic number.

It is not a de Polignac number, because 666906833 - 2¹² = 666902737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666906803) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7118 + ... + 37208.

It is an arithmetic number, because the mean of its divisors is an integer number (85762200).

Almost surely, 2^666906833 is an apocalyptic number.

It is an amenable number.

666906833 is a deficient number, since it is larger than the sum of its proper divisors (19190767).

666906833 is a wasteful number, since it uses less digits than its factorization.

666906833 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30727.

The product of its (nonzero) digits is 839808, while the sum is 47.

The square root of 666906833 is about 25824.5393569760. The cubic root of 666906833 is about 873.6853544504.

The spelling of 666906833 in words is "six hundred sixty-six million, nine hundred six thousand, eight hundred thirty-three".