866786517366864 has 80 divisors (see below), whose sum is σ = 2270759518410624. Its totient is φ = 284856532531200.

The previous prime is 866786517366829. The next prime is 866786517366881. The reversal of 866786517366864 is 468663715687668.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 349081404 + ... + 351555684.

Almost surely, 2^{866786517366864} is an apocalyptic number.

It is an amenable number.

866786517366864 is an abundant number, since it is smaller than the sum of its proper divisors (1403973001043760).

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

866786517366864 is a wasteful number, since it uses less digits than its factorization.

866786517366864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2577156 (or 2577150 counting only the distinct ones).

The product of its digits is 70230343680, while the sum is 87.

The spelling of 866786517366864 in words is "eight hundred sixty-six trillion, seven hundred eighty-six billion, five hundred seventeen million, three hundred sixty-six thousand, eight hundred sixty-four".