12566866511 has 2 divisors, whose sum is σ = 12566866512. Its totient is φ = 12566866510.

The previous prime is 12566866453. The next prime is 12566866519. The reversal of 12566866511 is 11566866521.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12566866511 is a prime.

It is a super-2 number, since 2×12566866511² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12566866519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6283433255 + 6283433256.

It is an arithmetic number, because the mean of its divisors is an integer number (6283433256).

Almost surely, 2^12566866511 is an apocalyptic number.

12566866511 is a deficient number, since it is larger than the sum of its proper divisors (1).

12566866511 is an equidigital number, since it uses as much as digits as its factorization.

12566866511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 518400, while the sum is 47.

The spelling of 12566866511 in words is "twelve billion, five hundred sixty-six million, eight hundred sixty-six thousand, five hundred eleven".