25136665513 has 2 divisors, whose sum is σ = 25136665514. Its totient is φ = 25136665512.

The previous prime is 25136665493. The next prime is 25136665529. The reversal of 25136665513 is 31556663152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17589921129 + 7546744384 = 132627^2 + 86872^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25136665513 is a prime.

It is a super-2 number, since 2×25136665513² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25136665513.

It is not a weakly prime, because it can be changed into another prime (25136605513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12568332756 + 12568332757.

It is an arithmetic number, because the mean of its divisors is an integer number (12568332757).

Almost surely, 2^25136665513 is an apocalyptic number.

It is an amenable number.

25136665513 is a deficient number, since it is larger than the sum of its proper divisors (1).

25136665513 is an equidigital number, since it uses as much as digits as its factorization.

25136665513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 486000, while the sum is 43.

The spelling of 25136665513 in words is "twenty-five billion, one hundred thirty-six million, six hundred sixty-five thousand, five hundred thirteen".