25698478529 has 2 divisors, whose sum is σ = 25698478530. Its totient is φ = 25698478528.

The previous prime is 25698478489. The next prime is 25698478571. The reversal of 25698478529 is 92587489652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19564456129 + 6134022400 = 139873^2 + 78320^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25698478529 is a prime.

It is not a weakly prime, because it can be changed into another prime (25698478229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12849239264 + 12849239265.

It is an arithmetic number, because the mean of its divisors is an integer number (12849239265).

Almost surely, 2^25698478529 is an apocalyptic number.

It is an amenable number.

25698478529 is a deficient number, since it is larger than the sum of its proper divisors (1).

25698478529 is an equidigital number, since it uses as much as digits as its factorization.

25698478529 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 87091200, while the sum is 65.

The spelling of 25698478529 in words is "twenty-five billion, six hundred ninety-eight million, four hundred seventy-eight thousand, five hundred twenty-nine".