866786515816068 has 96 divisors (see below), whose sum is σ = 2289821144688000. Its totient is φ = 283501664709120.

The previous prime is 866786515816061. The next prime is 866786515816121. The reversal of 866786515816068 is 860618515687668.

866786515816068 is a `hidden beast` number, since 8 + 6 + 6 + 7 + 86 + 515 + 8 + 16 + 0 + 6 + 8 = 666.

It is a super-2 number, since 2×866786515816068² (a number of 31 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (866786515816061) 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, 342929913 + ... + 345448256.

It is an arithmetic number, because the mean of its divisors is an integer number (23852303590500).

Almost surely, 2^{866786515816068} is an apocalyptic number.

It is an amenable number.

866786515816068 is an abundant number, since it is smaller than the sum of its proper divisors (1423034628871932).

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

866786515816068 is a wasteful number, since it uses less digits than its factorization.

866786515816068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 688378402 (or 688378394 counting only the distinct ones).

The product of its (nonzero) digits is 5573836800, while the sum is 81.

The spelling of 866786515816068 in words is "eight hundred sixty-six trillion, seven hundred eighty-six billion, five hundred fifteen million, eight hundred sixteen thousand, sixty-eight".