1800447705680 has 60 divisors (see below), whose sum is σ = 4532813569980. Its totient is φ = 664780686336.

The previous prime is 1800447705611. The next prime is 1800447705703. The reversal of 1800447705680 is 865077440081.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 640268828224 + 1160178877456 = 800168^2 + 1077116^2 .

It is a super-2 number, since 2×1800447705680² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66571085 + ... + 66598124.

It is an arithmetic number, because the mean of its divisors is an integer number (75546892833).

Almost surely, 2^{1800447705680} is an apocalyptic number.

1800447705680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1800447705680 is an abundant number, since it is smaller than the sum of its proper divisors (2732365864300).

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

1800447705680 is a wasteful number, since it uses less digits than its factorization.

1800447705680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133169248 (or 133169229 counting only the distinct ones).

The product of its (nonzero) digits is 1505280, while the sum is 50.

The spelling of 1800447705680 in words is "one trillion, eight hundred billion, four hundred forty-seven million, seven hundred five thousand, six hundred eighty".