666784366 has 8 divisors (see below), whose sum is σ = 1052817480. Its totient is φ = 315845208.

The previous prime is 666784337. The next prime is 666784379. The reversal of 666784366 is 663487666.

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

It is a congruent number.

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, 8773441 + ... + 8773516.

It is an arithmetic number, because the mean of its divisors is an integer number (131602185).

Almost surely, 2^666784366 is an apocalyptic number.

666784366 is a deficient number, since it is larger than the sum of its proper divisors (386033114).

666784366 is a wasteful number, since it uses less digits than its factorization.

666784366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17546978.

The product of its digits is 5225472, while the sum is 52.

The square root of 666784366 is about 25822.1681119150. The cubic root of 666784366 is about 873.6318716303.

The spelling of 666784366 in words is "six hundred sixty-six million, seven hundred eighty-four thousand, three hundred sixty-six".