665331766 has 8 divisors (see below), whose sum is σ = 1088724744. Its totient is φ = 302423520.

The previous prime is 665331739. The next prime is 665331767. The reversal of 665331766 is 667133566.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665331767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15121155 + ... + 15121198.

It is an arithmetic number, because the mean of its divisors is an integer number (136090593).

Almost surely, 2^665331766 is an apocalyptic number.

665331766 is a deficient number, since it is larger than the sum of its proper divisors (423392978).

665331766 is a wasteful number, since it uses less digits than its factorization.

665331766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30242366.

The product of its digits is 408240, while the sum is 43.

The square root of 665331766 is about 25794.0257811765. The cubic root of 665331766 is about 872.9970035591.

The spelling of 665331766 in words is "six hundred sixty-five million, three hundred thirty-one thousand, seven hundred sixty-six".