1809111621168 has 30 divisors (see below), whose sum is σ = 5062999884644. Its totient is φ = 603037207008.

The previous prime is 1809111621157. The next prime is 1809111621181. The reversal of 1809111621168 is 8611261119081.

It is a happy number.

1809111621168 is a `hidden beast` number, since 1 + 8 + 0 + 9 + 1 + 1 + 1 + 621 + 16 + 8 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6281637430 + ... + 6281637717.

Almost surely, 2^{1809111621168} is an apocalyptic number.

1809111621168 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1809111621168 is an abundant number, since it is smaller than the sum of its proper divisors (3253888263476).

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

1809111621168 is a wasteful number, since it uses less digits than its factorization.

1809111621168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12563275161 (or 12563275152 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 45.

The spelling of 1809111621168 in words is "one trillion, eight hundred nine billion, one hundred eleven million, six hundred twenty-one thousand, one hundred sixty-eight".