18445715845 has 8 divisors (see below), whose sum is σ = 22177347480. Its totient is φ = 14728247040.

The previous prime is 18445715807. The next prime is 18445715941. The reversal of 18445715845 is 54851754481.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 214505316 + 18231210529 = 14646^2 + 135023^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-18445715845 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18445715792 and 18445715801.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3537840 + ... + 3543049.

It is an arithmetic number, because the mean of its divisors is an integer number (2772168435).

Almost surely, 2^18445715845 is an apocalyptic number.

It is an amenable number.

18445715845 is a deficient number, since it is larger than the sum of its proper divisors (3731631635).

18445715845 is an equidigital number, since it uses as much as digits as its factorization.

18445715845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7081415.

The product of its digits is 3584000, while the sum is 52.

The spelling of 18445715845 in words is "eighteen billion, four hundred forty-five million, seven hundred fifteen thousand, eight hundred forty-five".