1809211680000 has 360 divisors, whose sum is σ = 6685572432000. Its totient is φ = 482455296000.

The previous prime is 1809211679999. The next prime is 1809211680037. The reversal of 1809211680000 is 861129081.

It is a tau number, because it is divible by the number of its divisors (360).

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 (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 4110601 + ... + 4529399.

Almost surely, 2^{1809211680000} is an apocalyptic number.

1809211680000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1809211680000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3342786216000).

1809211680000 is an abundant number, since it is smaller than the sum of its proper divisors (4876360752000).

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

1809211680000 is an frugal number, since it uses more digits than its factorization.

1809211680000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418844 (or 418809 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 36.

The spelling of 1809211680000 in words is "one trillion, eight hundred nine billion, two hundred eleven million, six hundred eighty thousand".