866786257580166 has 96 divisors (see below), whose sum is σ = 2391266647231488. Its totient is φ = 220349090056320.

The previous prime is 866786257580093. The next prime is 866786257580203. The reversal of 866786257580166 is 661085752687668.

866786257580166 is a `hidden beast` number, since 8 + 6 + 6 + 7 + 8 + 6 + 25 + 7 + 580 + 1 + 6 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6652987095 + ... + 6653117378.

It is an arithmetic number, because the mean of its divisors is an integer number (24909027575328).

Almost surely, 2^{866786257580166} is an apocalyptic number.

866786257580166 is an abundant number, since it is smaller than the sum of its proper divisors (1524480389651322).

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

866786257580166 is a wasteful number, since it uses less digits than its factorization.

866786257580166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13306104546 (or 13306104543 counting only the distinct ones).

The product of its (nonzero) digits is 9754214400, while the sum is 81.

The spelling of 866786257580166 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-six".