12667607081 has 2 divisors, whose sum is σ = 12667607082. Its totient is φ = 12667607080.

The previous prime is 12667607077. The next prime is 12667607093. The reversal of 12667607081 is 18070676621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12361881856 + 305725225 = 111184^2 + 17485^2 .

It is a cyclic number.

It is not a de Polignac number, because 12667607081 - 2² = 12667607077 is a prime.

It is a super-2 number, since 2×12667607081² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12667607881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6333803540 + 6333803541.

It is an arithmetic number, because the mean of its divisors is an integer number (6333803541).

Almost surely, 2^12667607081 is an apocalyptic number.

It is an amenable number.

12667607081 is a deficient number, since it is larger than the sum of its proper divisors (1).

12667607081 is an equidigital number, since it uses as much as digits as its factorization.

12667607081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 169344, while the sum is 44.

The spelling of 12667607081 in words is "twelve billion, six hundred sixty-seven million, six hundred seven thousand, eighty-one".