12695469581 has 2 divisors, whose sum is σ = 12695469582. Its totient is φ = 12695469580.

The previous prime is 12695469539. The next prime is 12695469599. The reversal of 12695469581 is 18596459621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7411488100 + 5283981481 = 86090^2 + 72691^2 .

It is an emirp because it is prime and its reverse (18596459621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12695469581 - 2¹⁰ = 12695468557 is a prime.

It is a super-2 number, since 2×12695469581² (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 (12695469181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6347734790 + 6347734791.

It is an arithmetic number, because the mean of its divisors is an integer number (6347734791).

Almost surely, 2^12695469581 is an apocalyptic number.

It is an amenable number.

12695469581 is a deficient number, since it is larger than the sum of its proper divisors (1).

12695469581 is an equidigital number, since it uses as much as digits as its factorization.

12695469581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4665600, while the sum is 56.

The spelling of 12695469581 in words is "twelve billion, six hundred ninety-five million, four hundred sixty-nine thousand, five hundred eighty-one".