865616272878 has 24 divisors (see below), whose sum is σ = 2013882757992. Its totient is φ = 247318935024.

The previous prime is 865616272849. The next prime is 865616272889. The reversal of 865616272878 is 878272616568.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1472136225 + ... + 1472136812.

It is an arithmetic number, because the mean of its divisors is an integer number (83911781583).

Almost surely, 2^865616272878 is an apocalyptic number.

865616272878 is an abundant number, since it is smaller than the sum of its proper divisors (1148266485114).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

865616272878 is a wasteful number, since it uses less digits than its factorization.

865616272878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2944273056 (or 2944273049 counting only the distinct ones).

The product of its digits is 108380160, while the sum is 66.

The spelling of 865616272878 in words is "eight hundred sixty-five billion, six hundred sixteen million, two hundred seventy-two thousand, eight hundred seventy-eight".