12627218161 has 4 divisors (see below), whose sum is σ = 12629151652. Its totient is φ = 12625284672.

The previous prime is 12627218159. The next prime is 12627218167. The reversal of 12627218161 is 16181272621.

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 1822863025 + 10804355136 = 42695^2 + 103944^2 .

It is a cyclic number.

It is not a de Polignac number, because 12627218161 - 2¹ = 12627218159 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12627218161.

It is not an unprimeable number, because it can be changed into a prime (12627218167) 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, 956916 + ... + 970021.

It is an arithmetic number, because the mean of its divisors is an integer number (3157287913).

Almost surely, 2^12627218161 is an apocalyptic number.

It is an amenable number.

12627218161 is a deficient number, since it is larger than the sum of its proper divisors (1933491).

12627218161 is an equidigital number, since it uses as much as digits as its factorization.

12627218161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1933490.

The product of its digits is 16128, while the sum is 37.

The spelling of 12627218161 in words is "twelve billion, six hundred twenty-seven million, two hundred eighteen thousand, one hundred sixty-one".