866802166031273 has 4 divisors (see below), whose sum is σ = 878676168305748. Its totient is φ = 854928163756800.

The previous prime is 866802166031239. The next prime is 866802166031293. The reversal of 866802166031273 is 372130661208668.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 748250725805584 + 118551440225689 = 27354172^2 + 10888133^2 .

It is a cyclic number.

It is not a de Polignac number, because 866802166031273 - 2⁶ = 866802166031209 is a prime.

It is a super-2 number, since 2×866802166031273² (a number of 31 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (866802166031293) 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 3 ways as a sum of consecutive naturals, for example, 5937001137128 + ... + 5937001137273.

It is an arithmetic number, because the mean of its divisors is an integer number (219669042076437).

Almost surely, 2^{866802166031273} is an apocalyptic number.

It is an amenable number.

866802166031273 is a deficient number, since it is larger than the sum of its proper divisors (11874002274475).

866802166031273 is a wasteful number, since it uses less digits than its factorization.

866802166031273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11874002274474.

The product of its (nonzero) digits is 20901888, while the sum is 59.

The spelling of 866802166031273 in words is "eight hundred sixty-six trillion, eight hundred two billion, one hundred sixty-six million, thirty-one thousand, two hundred seventy-three".