18040826817 has 20 divisors (see below), whose sum is σ = 29022946260. Its totient is φ = 11102046624.

The previous prime is 18040826777. The next prime is 18040826821. The reversal of 18040826817 is 71862804081.

18040826817 is a `hidden beast` number, since 180 + 408 + 2 + 68 + 1 + 7 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 4933095696 + 13107731121 = 70236^2 + 114489^2 .

It is not a de Polignac number, because 18040826817 - 2¹² = 18040822721 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (18040826017) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 8565342 + ... + 8567447.

It is an arithmetic number, because the mean of its divisors is an integer number (1451147313).

Almost surely, 2^18040826817 is an apocalyptic number.

It is an amenable number.

18040826817 is a deficient number, since it is larger than the sum of its proper divisors (10982119443).

18040826817 is a wasteful number, since it uses less digits than its factorization.

18040826817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17132814 (or 17132805 counting only the distinct ones).

The product of its (nonzero) digits is 172032, while the sum is 45.

The spelling of 18040826817 in words is "eighteen billion, forty million, eight hundred twenty-six thousand, eight hundred seventeen".