866827368155385 has 96 divisors (see below), whose sum is σ = 1849249022100480. Its totient is φ = 365778675569664.

The previous prime is 866827368155249. The next prime is 866827368155417. The reversal of 866827368155385 is 583551863728668.

866827368155385 is a `hidden beast` number, since 8 + 6 + 6 + 8 + 2 + 7 + 3 + 68 + 15 + 538 + 5 = 666.

It is not a de Polignac number, because 866827368155385 - 2¹⁸ = 866827367893241 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 463271437 + ... + 465138773.

It is an arithmetic number, because the mean of its divisors is an integer number (19263010646880).

Almost surely, 2^{866827368155385} is an apocalyptic number.

It is an amenable number.

866827368155385 is an abundant number, since it is smaller than the sum of its proper divisors (982421653945095).

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

866827368155385 is a wasteful number, since it uses less digits than its factorization.

866827368155385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1980727 (or 1980724 counting only the distinct ones).

The product of its digits is 13934592000, while the sum is 81.

The spelling of 866827368155385 in words is "eight hundred sixty-six trillion, eight hundred twenty-seven billion, three hundred sixty-eight million, one hundred fifty-five thousand, three hundred eighty-five".