1811444713856 has 64 divisors (see below), whose sum is σ = 3625711502400. Its totient is φ = 901465436160.

The previous prime is 1811444713847. The next prime is 1811444713861. The reversal of 1811444713856 is 6583174441181.

It is a tau number, because it is divible by the number of its divisors (64).

It is a junction number, because it is equal to n+sod(n) for n = 1811444713798 and 1811444713807.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81736505 + ... + 81758663.

It is an arithmetic number, because the mean of its divisors is an integer number (56651742225).

Almost surely, 2^{1811444713856} is an apocalyptic number.

1811444713856 is a gapful number since it is divisible by the number (16) 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 1811444713856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1812855751200).

1811444713856 is an abundant number, since it is smaller than the sum of its proper divisors (1814266788544).

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

1811444713856 is a wasteful number, since it uses less digits than its factorization.

1811444713856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25147 (or 25135 counting only the distinct ones).

The product of its digits is 2580480, while the sum is 53.

The spelling of 1811444713856 in words is "one trillion, eight hundred eleven billion, four hundred forty-four million, seven hundred thirteen thousand, eight hundred fifty-six".