17818686845 has 16 divisors (see below), whose sum is σ = 22318692480. Its totient is φ = 13631137344.

The previous prime is 17818686817. The next prime is 17818686869. The reversal of 17818686845 is 54868681871.

It is a cyclic number.

It is not a de Polignac number, because 17818686845 - 2¹⁶ = 17818621309 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 401786 + ... + 443924.

It is an arithmetic number, because the mean of its divisors is an integer number (1394918280).

Almost surely, 2^17818686845 is an apocalyptic number.

It is an amenable number.

17818686845 is a deficient number, since it is larger than the sum of its proper divisors (4500005635).

17818686845 is a wasteful number, since it uses less digits than its factorization.

17818686845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45844.

The product of its digits is 20643840, while the sum is 62.

The spelling of 17818686845 in words is "seventeen billion, eight hundred eighteen million, six hundred eighty-six thousand, eight hundred forty-five".