865164450999 has 16 divisors (see below), whose sum is σ = 1197867686400. Its totient is φ = 554770005216.

The previous prime is 865164450989. The next prime is 865164451001. The reversal of 865164450999 is 999054461568.

It is not a de Polignac number, because 865164450999 - 2⁵ = 865164450967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (865164450929) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18882859 + ... + 18928620.

It is an arithmetic number, because the mean of its divisors is an integer number (74866730400).

Almost surely, 2^865164450999 is an apocalyptic number.

865164450999 is a deficient number, since it is larger than the sum of its proper divisors (332703235401).

865164450999 is a wasteful number, since it uses less digits than its factorization.

865164450999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37811774.

The product of its (nonzero) digits is 83980800, while the sum is 66.

The spelling of 865164450999 in words is "eight hundred sixty-five billion, one hundred sixty-four million, four hundred fifty thousand, nine hundred ninety-nine".