1805681261916 has 288 divisors, whose sum is σ = 5464435616640. Its totient is φ = 491957286912.

The previous prime is 1805681261897. The next prime is 1805681261983. The reversal of 1805681261916 is 6191621865081.

1805681261916 is a `hidden beast` number, since 1 + 8 + 0 + 5 + 6 + 8 + 1 + 2 + 619 + 16 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 706170510 + ... + 706173066.

It is an arithmetic number, because the mean of its divisors is an integer number (18973734780).

Almost surely, 2^{1805681261916} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1805681261916, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2732217808320).

1805681261916 is an abundant number, since it is smaller than the sum of its proper divisors (3658754354724).

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

1805681261916 is a wasteful number, since it uses less digits than its factorization.

1805681261916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4093 (or 4088 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 54.

The spelling of 1805681261916 in words is "one trillion, eight hundred five billion, six hundred eighty-one million, two hundred sixty-one thousand, nine hundred sixteen".