866671873 has 4 divisors (see below), whose sum is σ = 896557140. Its totient is φ = 836786608.

The previous prime is 866671843. The next prime is 866671877. The reversal of 866671873 is 378176668.

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 382319809 + 484352064 = 19553^2 + 22008^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-866671873 is a prime.

It is a super-2 number, since 2×866671873² = 1502240270898656258, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 866671873.

It is not an unprimeable number, because it can be changed into a prime (866671877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14942590 + ... + 14942647.

It is an arithmetic number, because the mean of its divisors is an integer number (224139285).

Almost surely, 2^866671873 is an apocalyptic number.

It is an amenable number.

866671873 is a deficient number, since it is larger than the sum of its proper divisors (29885267).

866671873 is a wasteful number, since it uses less digits than its factorization.

866671873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29885266.

The product of its digits is 2032128, while the sum is 52.

The square root of 866671873 is about 29439.2913128017. The cubic root of 866671873 is about 953.4214111520.

The spelling of 866671873 in words is "eight hundred sixty-six million, six hundred seventy-one thousand, eight hundred seventy-three".