1801981818216 has 48 divisors (see below), whose sum is σ = 4993864349760. Its totient is φ = 586691753760.

The previous prime is 1801981818187. The next prime is 1801981818229. The reversal of 1801981818216 is 6128181891081.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

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, 291014640 + ... + 291020831.

It is an arithmetic number, because the mean of its divisors is an integer number (104038840620).

Almost surely, 2^{1801981818216} is an apocalyptic number.

It is an amenable number.

1801981818216 is an abundant number, since it is smaller than the sum of its proper divisors (3191882531544).

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

1801981818216 is a wasteful number, since it uses less digits than its factorization.

1801981818216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 582035526 (or 582035519 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 54.

The spelling of 1801981818216 in words is "one trillion, eight hundred one billion, nine hundred eighty-one million, eight hundred eighteen thousand, two hundred sixteen".