1808538243037 has 4 divisors (see below), whose sum is σ = 1808564215356. Its totient is φ = 1808512270720.

The previous prime is 1808538243011. The next prime is 1808538243053. The reversal of 1808538243037 is 7303428358081.

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 545834305636 + 1262703937401 = 738806^2 + 1123701^2 .

It is a cyclic number.

It is not a de Polignac number, because 1808538243037 - 2²³ = 1808529854429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1808538243067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12881428 + ... + 13021069.

It is an arithmetic number, because the mean of its divisors is an integer number (452141053839).

Almost surely, 2^{1808538243037} is an apocalyptic number.

It is an amenable number.

1808538243037 is a deficient number, since it is larger than the sum of its proper divisors (25972319).

1808538243037 is an equidigital number, since it uses as much as digits as its factorization.

1808538243037 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25972318.

The product of its (nonzero) digits is 3870720, while the sum is 52.

The spelling of 1808538243037 in words is "one trillion, eight hundred eight billion, five hundred thirty-eight million, two hundred forty-three thousand, thirty-seven".