866757862360161 has 12 divisors (see below), whose sum is σ = 1282519763818020. Its totient is φ = 563744951128320.

The previous prime is 866757862360109. The next prime is 866757862360177. The reversal of 866757862360161 is 161063268757668.

It is a happy number.

866757862360161 is a `hidden beast` number, since 8 + 6 + 6 + 7 + 5 + 7 + 8 + 6 + 2 + 3 + 601 + 6 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 174328319189025 + 692429543171136 = 13203345^2 + 26314056^2 .

It is not a de Polignac number, because 866757862360161 - 2¹⁴ = 866757862343777 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 866757862360161.

It is not an unprimeable number, because it can be changed into a prime (866757862360961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1174468647816 + ... + 1174468648553.

It is an arithmetic number, because the mean of its divisors is an integer number (106876646984835).

Almost surely, 2^{866757862360161} is an apocalyptic number.

It is an amenable number.

866757862360161 is a deficient number, since it is larger than the sum of its proper divisors (415761901457859).

866757862360161 is a wasteful number, since it uses less digits than its factorization.

866757862360161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2348937296416 (or 2348937296413 counting only the distinct ones).

The product of its (nonzero) digits is 731566080, while the sum is 72.

The spelling of 866757862360161 in words is "eight hundred sixty-six trillion, seven hundred fifty-seven billion, eight hundred sixty-two million, three hundred sixty thousand, one hundred sixty-one".