18220036608 has 60 divisors (see below), whose sum is σ = 52584272598. Its totient is φ = 6073344000.

The previous prime is 18220036553. The next prime is 18220036609. The reversal of 18220036608 is 80663002281.

18220036608 is a `hidden beast` number, since 18 + 2 + 2 + 0 + 0 + 36 + 608 = 666.

It can be written as a sum of positive squares in only one way, i.e., 15827652864 + 2392383744 = 125808^2 + 48912^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (18220036609) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1972393 + ... + 1981608.

Almost surely, 2^18220036608 is an apocalyptic number.

18220036608 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18220036608 is an abundant number, since it is smaller than the sum of its proper divisors (34364235990).

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

18220036608 is an equidigital number, since it uses as much as digits as its factorization.

18220036608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3954025 (or 3954006 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

Adding to 18220036608 its reverse (80663002281), we get a palindrome (98883038889).

The spelling of 18220036608 in words is "eighteen billion, two hundred twenty million, thirty-six thousand, six hundred eight".