18006220648 has 16 divisors (see below), whose sum is σ = 36358714980. Its totient is φ = 8310563328.

The previous prime is 18006220613. The next prime is 18006220649. The reversal of 18006220648 is 84602260081.

It can be written as a sum of positive squares in 2 ways, for example, as 12782111364 + 5224109284 = 113058^2 + 72278^2 .

It is not an unprimeable number, because it can be changed into a prime (18006220649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86568265 + ... + 86568472.

Almost surely, 2^18006220648 is an apocalyptic number.

It is an amenable number.

18006220648 is an abundant number, since it is smaller than the sum of its proper divisors (18352494332).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18006220648 is a wasteful number, since it uses less digits than its factorization.

18006220648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173136756 (or 173136752 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 37.

The spelling of 18006220648 in words is "eighteen billion, six million, two hundred twenty thousand, six hundred forty-eight".