18025421216 has 24 divisors (see below), whose sum is σ = 38713689504. Its totient is φ = 8193373120.

The previous prime is 18025421209. The next prime is 18025421243. The reversal of 18025421216 is 61212452081.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25603940 + ... + 25604643.

It is an arithmetic number, because the mean of its divisors is an integer number (1613070396).

Almost surely, 2^18025421216 is an apocalyptic number.

18025421216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18025421216 is an abundant number, since it is smaller than the sum of its proper divisors (20688268288).

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

18025421216 is a wasteful number, since it uses less digits than its factorization.

18025421216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51208604 (or 51208596 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 32.

Adding to 18025421216 its reverse (61212452081), we get a palindrome (79237873297).

The spelling of 18025421216 in words is "eighteen billion, twenty-five million, four hundred twenty-one thousand, two hundred sixteen".