666681383 has 8 divisors (see below), whose sum is σ = 681407280. Its totient is φ = 652078080.

The previous prime is 666681343. The next prime is 666681397. The reversal of 666681383 is 383186666.

It is a happy number.

666681383 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666681383 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 (666681313) 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, 19610 + ... + 41447.

It is an arithmetic number, because the mean of its divisors is an integer number (85175910).

Almost surely, 2^666681383 is an apocalyptic number.

666681383 is a deficient number, since it is larger than the sum of its proper divisors (14725897).

666681383 is a wasteful number, since it uses less digits than its factorization.

666681383 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61297.

The product of its digits is 746496, while the sum is 47.

The square root of 666681383 is about 25820.1739537130. The cubic root of 666681383 is about 873.5868926397.

The spelling of 666681383 in words is "six hundred sixty-six million, six hundred eighty-one thousand, three hundred eighty-three".