12238155809081 has 4 divisors (see below), whose sum is σ = 12568916776932. Its totient is φ = 11907394841232.

The previous prime is 12238155809071. The next prime is 12238155809149. The reversal of 12238155809081 is 18090855183221.

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 10521751875625 + 1716403933456 = 3243725^2 + 1310116^2 .

It is a cyclic number.

It is not a de Polignac number, because 12238155809081 - 2¹⁴ = 12238155792697 is a prime.

It is a super-2 number, since 2×12238155809081² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12238155809041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 165380483870 + ... + 165380483943.

It is an arithmetic number, because the mean of its divisors is an integer number (3142229194233).

Almost surely, 2^{12238155809081} is an apocalyptic number.

It is an amenable number.

12238155809081 is a deficient number, since it is larger than the sum of its proper divisors (330760967851).

12238155809081 is an equidigital number, since it uses as much as digits as its factorization.

12238155809081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330760967850.

The product of its (nonzero) digits is 1382400, while the sum is 53.

The spelling of 12238155809081 in words is "twelve trillion, two hundred thirty-eight billion, one hundred fifty-five million, eight hundred nine thousand, eighty-one".