1801993704193 has 4 divisors (see below), whose sum is σ = 1802013747268. Its totient is φ = 1801973661120.

The previous prime is 1801993704187. The next prime is 1801993704209. The reversal of 1801993704193 is 3914073991081.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 95396352769 + 1706597351424 = 308863^2 + 1306368^2 .

It is a cyclic number.

It is not a de Polignac number, because 1801993704193 - 2²¹ = 1801991607041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1801993704293) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 9886068 + ... + 10066693.

It is an arithmetic number, because the mean of its divisors is an integer number (450503436817).

Almost surely, 2^{1801993704193} is an apocalyptic number.

It is an amenable number.

1801993704193 is a deficient number, since it is larger than the sum of its proper divisors (20043075).

1801993704193 is an equidigital number, since it uses as much as digits as its factorization.

1801993704193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20043074.

The product of its (nonzero) digits is 1469664, while the sum is 55.

The spelling of 1801993704193 in words is "one trillion, eight hundred one billion, nine hundred ninety-three million, seven hundred four thousand, one hundred ninety-three".