12667126217 has 4 divisors (see below), whose sum is σ = 12669166020. Its totient is φ = 12665086416.

The previous prime is 12667126187. The next prime is 12667126223. The reversal of 12667126217 is 71262176621.

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 8025293056 + 4641833161 = 89584^2 + 68131^2 .

It is a cyclic number.

It is not a de Polignac number, because 12667126217 - 2¹⁸ = 12666864073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12667126247) 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, 1010558 + ... + 1023015.

It is an arithmetic number, because the mean of its divisors is an integer number (3167291505).

Almost surely, 2^12667126217 is an apocalyptic number.

It is an amenable number.

12667126217 is a deficient number, since it is larger than the sum of its proper divisors (2039803).

12667126217 is an equidigital number, since it uses as much as digits as its factorization.

12667126217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2039802.

The product of its digits is 84672, while the sum is 41.

The spelling of 12667126217 in words is "twelve billion, six hundred sixty-seven million, one hundred twenty-six thousand, two hundred seventeen".