12181825577 has 4 divisors (see below), whose sum is σ = 12478943316. Its totient is φ = 11884707840.

The previous prime is 12181825543. The next prime is 12181825603. The reversal of 12181825577 is 77552818121.

12181825577 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77552818121 = 251 ⋅308975371.

It can be written as a sum of positive squares in 2 ways, for example, as 243859456 + 11937966121 = 15616^2 + 109261^2 .

It is a cyclic number.

It is not a de Polignac number, because 12181825577 - 2¹⁴ = 12181809193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12181827577) 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, 148558808 + ... + 148558889.

It is an arithmetic number, because the mean of its divisors is an integer number (3119735829).

Almost surely, 2^12181825577 is an apocalyptic number.

It is an amenable number.

12181825577 is a deficient number, since it is larger than the sum of its proper divisors (297117739).

12181825577 is an equidigital number, since it uses as much as digits as its factorization.

12181825577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297117738.

The product of its digits is 313600, while the sum is 47.

The spelling of 12181825577 in words is "twelve billion, one hundred eighty-one million, eight hundred twenty-five thousand, five hundred seventy-seven".