866786513765983 has 8 divisors (see below), whose sum is σ = 874927849317840. Its totient is φ = 858645928714560.

The previous prime is 866786513765941. The next prime is 866786513765989. The reversal of 866786513765983 is 389567315687668.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 866786513765983 - 2²⁵ = 866786480211551 is a prime.

It is a super-2 number, since 2×866786513765983² (a number of 31 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 866786513765894 and 866786513765903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866786513765989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 185304238 + ... + 189924283.

It is an arithmetic number, because the mean of its divisors is an integer number (109365981164730).

Almost surely, 2^{866786513765983} is an apocalyptic number.

866786513765983 is a deficient number, since it is larger than the sum of its proper divisors (8141335551857).

866786513765983 is a wasteful number, since it uses less digits than its factorization.

866786513765983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375250217.

The product of its digits is 65840947200, while the sum is 88.

The spelling of 866786513765983 in words is "eight hundred sixty-six trillion, seven hundred eighty-six billion, five hundred thirteen million, seven hundred sixty-five thousand, nine hundred eighty-three".