805802188018 has 32 divisors (see below), whose sum is σ = 1247647981104. Its totient is φ = 390033211392.

The previous prime is 805802187991. The next prime is 805802188027. The reversal of 805802188018 is 810881208508.

It can be written as a sum of positive squares in 8 ways, for example, as 786692719849 + 19109468169 = 886957^2 + 138237^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16654630 + ... + 16702942.

Almost surely, 2^805802188018 is an apocalyptic number.

805802188018 is a deficient number, since it is larger than the sum of its proper divisors (441845793086).

805802188018 is a wasteful number, since it uses less digits than its factorization.

805802188018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49486.

The product of its (nonzero) digits is 327680, while the sum is 49.

The spelling of 805802188018 in words is "eight hundred five billion, eight hundred two million, one hundred eighty-eight thousand, eighteen".