866786514037171 has 32 divisors (see below), whose sum is σ = 1067047190773760. Its totient is φ = 685659329357184.

The previous prime is 866786514037079. The next prime is 866786514037189. The reversal of 866786514037171 is 171730415687668.

It is not a de Polignac number, because 866786514037171 - 2⁴³ = 857990421014963 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 866786514037171.

It is not an unprimeable number, because it can be changed into a prime (866786514037271) 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, 8356691716 + ... + 8356795438.

It is an arithmetic number, because the mean of its divisors is an integer number (33345224711680).

Almost surely, 2^{866786514037171} is an apocalyptic number.

866786514037171 is a deficient number, since it is larger than the sum of its proper divisors (200260676736589).

866786514037171 is a wasteful number, since it uses less digits than its factorization.

866786514037171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122915.

The product of its (nonzero) digits is 284497920, while the sum is 70.

The spelling of 866786514037171 in words is "eight hundred sixty-six trillion, seven hundred eighty-six billion, five hundred fourteen million, thirty-seven thousand, one hundred seventy-one".