866786514038478 has 96 divisors (see below), whose sum is σ = 2137868479648512. Its totient is φ = 251239708368000.

The previous prime is 866786514038461. The next prime is 866786514038483. The reversal of 866786514038478 is 874830415687668.

866786514038478 is a `hidden beast` number, since 8 + 6 + 6 + 7 + 8 + 65 + 1 + 403 + 84 + 78 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 866786514038397 and 866786514038406.

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, 433458601 + ... + 435453707.

It is an arithmetic number, because the mean of its divisors is an integer number (22269463329672).

Almost surely, 2^{866786514038478} is an apocalyptic number.

866786514038478 is an abundant number, since it is smaller than the sum of its proper divisors (1271081965610034).

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

866786514038478 is a wasteful number, since it uses less digits than its factorization.

866786514038478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2090550 (or 2090547 counting only the distinct ones).

The product of its (nonzero) digits is 10404495360, while the sum is 81.

The spelling of 866786514038478 in words is "eight hundred sixty-six trillion, seven hundred eighty-six billion, five hundred fourteen million, thirty-eight thousand, four hundred seventy-eight".