866786274765873 has 32 divisors (see below), whose sum is σ = 1600990521937920. Its totient is φ = 450278584292880.

The previous prime is 866786274765773. The next prime is 866786274765911. The reversal of 866786274765873 is 378567472687668.

866786274765873 is a `hidden beast` number, since 8 + 6 + 6 + 7 + 8 + 62 + 7 + 476 + 5 + 8 + 73 = 666.

It is not a de Polignac number, because 866786274765873 - 2¹² = 866786274761777 is a prime.

It is a super-2 number, since 2×866786274765873² (a number of 31 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (866786274765773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 208462305465 + ... + 208462309622.

It is an arithmetic number, because the mean of its divisors is an integer number (50030953810560).

Almost surely, 2^{866786274765873} is an apocalyptic number.

It is an amenable number.

866786274765873 is a deficient number, since it is larger than the sum of its proper divisors (734204247172047).

866786274765873 is a wasteful number, since it uses less digits than its factorization.

866786274765873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416924615114 (or 416924615108 counting only the distinct ones).

The product of its digits is 191182602240, while the sum is 90.

The spelling of 866786274765873 in words is "eight hundred sixty-six trillion, seven hundred eighty-six billion, two hundred seventy-four million, seven hundred sixty-five thousand, eight hundred seventy-three".