1809694159872 has 44 divisors (see below), whose sum is σ = 4823494728576. Its totient is φ = 603231385600.

The previous prime is 1809694159843. The next prime is 1809694159879. The reversal of 1809694159872 is 2789514969081.

It is a junction number, because it is equal to n+sod(n) for n = 1809694159797 and 1809694159806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1809694159879) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 294543504 + ... + 294549647.

Almost surely, 2^{1809694159872} is an apocalyptic number.

1809694159872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1809694159872 is an abundant number, since it is smaller than the sum of its proper divisors (3013800568704).

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

1809694159872 is an equidigital number, since it uses as much as digits as its factorization.

1809694159872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 589093174 (or 589093156 counting only the distinct ones).

The product of its (nonzero) digits is 78382080, while the sum is 69.

The spelling of 1809694159872 in words is "one trillion, eight hundred nine billion, six hundred ninety-four million, one hundred fifty-nine thousand, eight hundred seventy-two".