665874863 has 4 divisors (see below), whose sum is σ = 694825968. Its totient is φ = 636923760.

The previous prime is 665874857. The next prime is 665874907. The reversal of 665874863 is 368478566.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 665874863 - 2¹⁰ = 665873839 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 (665874263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14475518 + ... + 14475563.

It is an arithmetic number, because the mean of its divisors is an integer number (173706492).

Almost surely, 2^665874863 is an apocalyptic number.

665874863 is a deficient number, since it is larger than the sum of its proper divisors (28951105).

665874863 is a wasteful number, since it uses less digits than its factorization.

665874863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28951104.

The product of its digits is 5806080, while the sum is 53.

The square root of 665874863 is about 25804.5512071030. The cubic root of 665874863 is about 873.2344756148.

The spelling of 665874863 in words is "six hundred sixty-five million, eight hundred seventy-four thousand, eight hundred sixty-three".