666681382 has 8 divisors (see below), whose sum is σ = 1018890576. Its totient is φ = 327051192.

The previous prime is 666681343. The next prime is 666681397. The reversal of 666681382 is 283186666.

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, 3144618 + ... + 3144829.

It is an arithmetic number, because the mean of its divisors is an integer number (127361322).

Almost surely, 2^666681382 is an apocalyptic number.

666681382 is a deficient number, since it is larger than the sum of its proper divisors (352209194).

666681382 is a wasteful number, since it uses less digits than its factorization.

666681382 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6289502.

The product of its digits is 497664, while the sum is 46.

The square root of 666681382 is about 25820.1739343483. The cubic root of 666681382 is about 873.5868922029.

The spelling of 666681382 in words is "six hundred sixty-six million, six hundred eighty-one thousand, three hundred eighty-two".