865864361215 has 32 divisors (see below), whose sum is σ = 1255893834240. Its totient is φ = 559820419200.

The previous prime is 865864361213. The next prime is 865864361231. The reversal of 865864361215 is 512163468568.

It is not a de Polignac number, because 865864361215 - 2¹ = 865864361213 is a prime.

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (865864361213) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2945116 + ... + 3225745.

It is an arithmetic number, because the mean of its divisors is an integer number (39246682320).

Almost surely, 2^865864361215 is an apocalyptic number.

865864361215 is a deficient number, since it is larger than the sum of its proper divisors (390029473025).

865864361215 is a wasteful number, since it uses less digits than its factorization.

865864361215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6171103.

The product of its digits is 8294400, while the sum is 55.

The spelling of 865864361215 in words is "eight hundred sixty-five billion, eight hundred sixty-four million, three hundred sixty-one thousand, two hundred fifteen".