12662256181 has 4 divisors (see below), whose sum is σ = 12663204012. Its totient is φ = 12661308352.

The previous prime is 12662256179. The next prime is 12662256199. The reversal of 12662256181 is 18165226621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18165226621 = 19 ⋅956064559.

It can be written as a sum of positive squares in 2 ways, for example, as 3989059281 + 8673196900 = 63159^2 + 93130^2 .

It is a cyclic number.

It is not a de Polignac number, because 12662256181 - 2¹ = 12662256179 is a prime.

It is a super-2 number, since 2×12662256181² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12662256161) 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, 453586 + ... + 480691.

It is an arithmetic number, because the mean of its divisors is an integer number (3165801003).

Almost surely, 2^12662256181 is an apocalyptic number.

It is an amenable number.

12662256181 is a deficient number, since it is larger than the sum of its proper divisors (947831).

12662256181 is an equidigital number, since it uses as much as digits as its factorization.

12662256181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 947830.

The product of its digits is 69120, while the sum is 40.

The spelling of 12662256181 in words is "twelve billion, six hundred sixty-two million, two hundred fifty-six thousand, one hundred eighty-one".