12667607181 has 6 divisors (see below), whose sum is σ = 18297654830. Its totient is φ = 8445071448.

The previous prime is 12667607149. The next prime is 12667607201. The reversal of 12667607181 is 18170676621.

12667607181 is a `hidden beast` number, since 1 + 26 + 6 + 7 + 607 + 18 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 12070537956 + 597069225 = 109866^2 + 24435^2 .

It is not a de Polignac number, because 12667607181 - 2⁵ = 12667607149 is a prime.

It is a super-2 number, since 2×12667607181² (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 (12667607081) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 703755946 + ... + 703755963.

Almost surely, 2^12667607181 is an apocalyptic number.

It is an amenable number.

12667607181 is a deficient number, since it is larger than the sum of its proper divisors (5630047649).

12667607181 is a wasteful number, since it uses less digits than its factorization.

12667607181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1407511915 (or 1407511912 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 45.

The spelling of 12667607181 in words is "twelve billion, six hundred sixty-seven million, six hundred seven thousand, one hundred eighty-one".