12566235989 has 2 divisors, whose sum is σ = 12566235990. Its totient is φ = 12566235988.

The previous prime is 12566235977. The next prime is 12566236003. The reversal of 12566235989 is 98953266521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12052307089 + 513928900 = 109783^2 + 22670^2 .

It is a cyclic number.

It is not a de Polignac number, because 12566235989 - 2²⁰ = 12565187413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12566232989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6283117994 + 6283117995.

It is an arithmetic number, because the mean of its divisors is an integer number (6283117995).

Almost surely, 2^12566235989 is an apocalyptic number.

It is an amenable number.

12566235989 is a deficient number, since it is larger than the sum of its proper divisors (1).

12566235989 is an equidigital number, since it uses as much as digits as its factorization.

12566235989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6998400, while the sum is 56.

The spelling of 12566235989 in words is "twelve billion, five hundred sixty-six million, two hundred thirty-five thousand, nine hundred eighty-nine".