866162023678215 has 160 divisors (see below), whose sum is σ = 1694865501407232. Its totient is φ = 419700191040000.

The previous prime is 866162023678177. The next prime is 866162023678283. The reversal of 866162023678215 is 512876320261668.

866162023678215 is a `hidden beast` number, since 8 + 6 + 61 + 6 + 202 + 367 + 8 + 2 + 1 + 5 = 666.

It is not a de Polignac number, because 866162023678215 - 2¹¹ = 866162023676167 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 73397335315 + ... + 73397347115.

Almost surely, 2^{866162023678215} is an apocalyptic number.

866162023678215 is a deficient number, since it is larger than the sum of its proper divisors (828703477729017).

866162023678215 is a wasteful number, since it uses less digits than its factorization.

866162023678215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20523 (or 20514 counting only the distinct ones).

The product of its (nonzero) digits is 69672960, while the sum is 63.

The spelling of 866162023678215 in words is "eight hundred sixty-six trillion, one hundred sixty-two billion, twenty-three million, six hundred seventy-eight thousand, two hundred fifteen".