18169854845 has 4 divisors (see below), whose sum is σ = 21803825820. Its totient is φ = 14535883872.

The previous prime is 18169854803. The next prime is 18169854863. The reversal of 18169854845 is 54845896181.

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 5631902116 + 12537952729 = 75046^2 + 111973^2 .

It is a cyclic number.

It is not a de Polignac number, because 18169854845 - 2¹⁴ = 18169838461 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1816985480 + ... + 1816985489.

It is an arithmetic number, because the mean of its divisors is an integer number (5450956455).

Almost surely, 2^18169854845 is an apocalyptic number.

It is an amenable number.

18169854845 is a deficient number, since it is larger than the sum of its proper divisors (3633970975).

18169854845 is an equidigital number, since it uses as much as digits as its factorization.

18169854845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3633970974.

The product of its digits is 11059200, while the sum is 59.

The spelling of 18169854845 in words is "eighteen billion, one hundred sixty-nine million, eight hundred fifty-four thousand, eight hundred forty-five".