666856733 has 8 divisors (see below), whose sum is σ = 698053248. Its totient is φ = 635843824.

The previous prime is 666856703. The next prime is 666856741. The reversal of 666856733 is 337658666.

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 666856733 - 2¹⁸ = 666594589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666856703) 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, 38441 + ... + 53022.

It is an arithmetic number, because the mean of its divisors is an integer number (87256656).

Almost surely, 2^666856733 is an apocalyptic number.

It is an amenable number.

666856733 is a deficient number, since it is larger than the sum of its proper divisors (31196515).

666856733 is a wasteful number, since it uses less digits than its factorization.

666856733 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91803.

The product of its digits is 3265920, while the sum is 50.

The square root of 666856733 is about 25823.5693311362. The cubic root of 666856733 is about 873.6634759659.

The spelling of 666856733 in words is "six hundred sixty-six million, eight hundred fifty-six thousand, seven hundred thirty-three".