18180180216 has 64 divisors (see below), whose sum is σ = 55091462400. Its totient is φ = 5509144800.

The previous prime is 18180180211. The next prime is 18180180217. The reversal of 18180180216 is 61208108181.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18180180211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3823420 + ... + 3828171.

It is an arithmetic number, because the mean of its divisors is an integer number (860804100).

Almost surely, 2^18180180216 is an apocalyptic number.

It is an amenable number.

18180180216 is an abundant number, since it is smaller than the sum of its proper divisors (36911282184).

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

18180180216 is a wasteful number, since it uses less digits than its factorization.

18180180216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7651617 (or 7651607 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 36.

Adding to 18180180216 its reverse (61208108181), we get a palindrome (79388288397).

The spelling of 18180180216 in words is "eighteen billion, one hundred eighty million, one hundred eighty thousand, two hundred sixteen".