865690663 has 4 divisors (see below), whose sum is σ = 885823048. Its totient is φ = 845558280.

The previous prime is 865690607. The next prime is 865690667. The reversal of 865690663 is 366096568.

865690663 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 865690663 - 2²⁵ = 832136231 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (865690667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10066128 + ... + 10066213.

It is an arithmetic number, because the mean of its divisors is an integer number (221455762).

Almost surely, 2^865690663 is an apocalyptic number.

865690663 is a deficient number, since it is larger than the sum of its proper divisors (20132385).

865690663 is a wasteful number, since it uses less digits than its factorization.

865690663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20132384.

The product of its (nonzero) digits is 1399680, while the sum is 49.

The square root of 865690663 is about 29422.6216201072. The cubic root of 865690663 is about 953.0614672019.

The spelling of 865690663 in words is "eight hundred sixty-five million, six hundred ninety thousand, six hundred sixty-three".