18173860245 has 20 divisors (see below), whose sum is σ = 32578327980. Its totient is φ = 9692725248.

The previous prime is 18173860223. The next prime is 18173860261. The reversal of 18173860245 is 54206837181.

18173860245 is a `hidden beast` number, since 1 + 8 + 1 + 7 + 38 + 602 + 4 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 3090581649 + 15083278596 = 55593^2 + 122814^2 .

It is not a de Polignac number, because 18173860245 - 2⁶ = 18173860181 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 18173860245.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 22436460 + ... + 22437269.

It is an arithmetic number, because the mean of its divisors is an integer number (1628916399).

Almost surely, 2^18173860245 is an apocalyptic number.

18173860245 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18173860245 is a deficient number, since it is larger than the sum of its proper divisors (14404467735).

18173860245 is an equidigital number, since it uses as much as digits as its factorization.

18173860245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44873746 (or 44873737 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 45.

The spelling of 18173860245 in words is "eighteen billion, one hundred seventy-three million, eight hundred sixty thousand, two hundred forty-five".