866786257580165 has 32 divisors (see below), whose sum is σ = 1169280572544000. Its totient is φ = 612480299650560.

The previous prime is 866786257580093. The next prime is 866786257580203. The reversal of 866786257580165 is 561085752687668.

It is not a de Polignac number, because 866786257580165 - 2¹⁴ = 866786257563781 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 866786257580165.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2416488515 + ... + 2416847184.

It is an arithmetic number, because the mean of its divisors is an integer number (36540017892000).

Almost surely, 2^{866786257580165} is an apocalyptic number.

It is an amenable number.

866786257580165 is a deficient number, since it is larger than the sum of its proper divisors (302494314963835).

866786257580165 is a wasteful number, since it uses less digits than its factorization.

866786257580165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4833335837.

The product of its (nonzero) digits is 8128512000, while the sum is 80.

The spelling of 866786257580165 in words is "eight hundred sixty-six trillion, seven hundred eighty-six billion, two hundred fifty-seven million, five hundred eighty thousand, one hundred sixty-five".