1800218016 has 72 divisors (see below), whose sum is σ = 5125891680. Its totient is φ = 599308416.

The previous prime is 1800217987. The next prime is 1800218039. The reversal of 1800218016 is 6108120081.

It is a tau number, because it is divible by the number of its divisors (72).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 250765 + ... + 257843.

It is an arithmetic number, because the mean of its divisors is an integer number (71192940).

Almost surely, 2^1800218016 is an apocalyptic number.

1800218016 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1800218016 is an abundant number, since it is smaller than the sum of its proper divisors (3325673664).

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

1800218016 is a wasteful number, since it uses less digits than its factorization.

1800218016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7978 (or 7967 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 27.

The square root of 1800218016 is about 42428.9761365980. The cubic root of 1800218016 is about 1216.4895088857.

Adding to 1800218016 its reverse (6108120081), we get a palindrome (7908338097).

The spelling of 1800218016 in words is "one billion, eight hundred million, two hundred eighteen thousand, sixteen".