18145502845 has 4 divisors (see below), whose sum is σ = 21774603420. Its totient is φ = 14516402272.

The previous prime is 18145502821. The next prime is 18145502849. The reversal of 18145502845 is 54820554181.

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 9633226201 + 8512276644 = 98149^2 + 92262^2 .

It is a cyclic number.

It is not a de Polignac number, because 18145502845 - 2¹¹ = 18145500797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18145502849) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1814550280 + ... + 1814550289.

It is an arithmetic number, because the mean of its divisors is an integer number (5443650855).

Almost surely, 2^18145502845 is an apocalyptic number.

It is an amenable number.

18145502845 is a deficient number, since it is larger than the sum of its proper divisors (3629100575).

18145502845 is an equidigital number, since it uses as much as digits as its factorization.

18145502845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3629100574.

The product of its (nonzero) digits is 256000, while the sum is 43.

The spelling of 18145502845 in words is "eighteen billion, one hundred forty-five million, five hundred two thousand, eight hundred forty-five".