12266641371781 has 2 divisors, whose sum is σ = 12266641371782. Its totient is φ = 12266641371780.

The previous prime is 12266641371779. The next prime is 12266641371821. The reversal of 12266641371781 is 18717314666221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7375754315556 + 4890887056225 = 2715834^2 + 2211535^2 .

It is a cyclic number.

It is not a de Polignac number, because 12266641371781 - 2¹ = 12266641371779 is a prime.

It is a super-2 number, since 2×12266641371781² (a number of 27 digits) contains 22 as substring.

Together with 12266641371779, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12266641378781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6133320685890 + 6133320685891.

It is an arithmetic number, because the mean of its divisors is an integer number (6133320685891).

Almost surely, 2^{12266641371781} is an apocalyptic number.

It is an amenable number.

12266641371781 is a deficient number, since it is larger than the sum of its proper divisors (1).

12266641371781 is an equidigital number, since it uses as much as digits as its factorization.

12266641371781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4064256, while the sum is 55.

The spelling of 12266641371781 in words is "twelve trillion, two hundred sixty-six billion, six hundred forty-one million, three hundred seventy-one thousand, seven hundred eighty-one".