18453971845 has 4 divisors (see below), whose sum is σ = 22144766220. Its totient is φ = 14763177472.

The previous prime is 18453971831. The next prime is 18453971881. The reversal of 18453971845 is 54817935481.

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 5101244929 + 13352726916 = 71423^2 + 115554^2 .

It is a cyclic number.

It is not a de Polignac number, because 18453971845 - 2¹¹ = 18453969797 is a prime.

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, 1845397180 + ... + 1845397189.

It is an arithmetic number, because the mean of its divisors is an integer number (5536191555).

Almost surely, 2^18453971845 is an apocalyptic number.

It is an amenable number.

18453971845 is a deficient number, since it is larger than the sum of its proper divisors (3690794375).

18453971845 is an equidigital number, since it uses as much as digits as its factorization.

18453971845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3690794374.

The product of its digits is 4838400, while the sum is 55.

The spelling of 18453971845 in words is "eighteen billion, four hundred fifty-three million, nine hundred seventy-one thousand, eight hundred forty-five".