1816411237205 has 6 divisors (see below), whose sum is σ = 2179697101026. Its totient is φ = 1453126578848.

The previous prime is 1816411237139. The next prime is 1816411237211. The reversal of 1816411237205 is 5027321146181.

It can be written as a sum of positive squares in 3 ways, for example, as 12845502244 + 1803565734961 = 113338^2 + 1342969^2 .

It is not a de Polignac number, because 1816411237205 - 2¹⁰ = 1816411236181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2712281 + ... + 3315009.

It is an arithmetic number, because the mean of its divisors is an integer number (363282850171).

Almost surely, 2^{1816411237205} is an apocalyptic number.

It is an amenable number.

1816411237205 is a deficient number, since it is larger than the sum of its proper divisors (363285863821).

1816411237205 is an frugal number, since it uses more digits than its factorization.

1816411237205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1205463 (or 602734 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 41.

The spelling of 1816411237205 in words is "one trillion, eight hundred sixteen billion, four hundred eleven million, two hundred thirty-seven thousand, two hundred five".