1801801800216 has 64 divisors (see below), whose sum is σ = 5460005462400. Its totient is φ = 546000544800.

The previous prime is 1801801800191. The next prime is 1801801800233. The reversal of 1801801800216 is 6120081081081.

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 an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 379164670 + ... + 379169421.

It is an arithmetic number, because the mean of its divisors is an integer number (85312585350).

Almost surely, 2^{1801801800216} is an apocalyptic number.

It is an amenable number.

1801801800216 is an abundant number, since it is smaller than the sum of its proper divisors (3658203662184).

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

1801801800216 is a wasteful number, since it uses less digits than its factorization.

1801801800216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 758334117 (or 758334107 counting only the distinct ones).

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

Adding to 1801801800216 its reverse (6120081081081), we get a palindrome (7921882881297).

The spelling of 1801801800216 in words is "one trillion, eight hundred one billion, eight hundred one million, eight hundred thousand, two hundred sixteen".