25265128789 has 2 divisors, whose sum is σ = 25265128790. Its totient is φ = 25265128788.

The previous prime is 25265128753. The next prime is 25265128841. The reversal of 25265128789 is 98782156252.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15067562500 + 10197566289 = 122750^2 + 100983^2 .

It is a cyclic number.

It is not a de Polignac number, because 25265128789 - 2¹⁹ = 25264604501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25265128709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12632564394 + 12632564395.

It is an arithmetic number, because the mean of its divisors is an integer number (12632564395).

Almost surely, 2^25265128789 is an apocalyptic number.

It is an amenable number.

25265128789 is a deficient number, since it is larger than the sum of its proper divisors (1).

25265128789 is an equidigital number, since it uses as much as digits as its factorization.

25265128789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4838400, while the sum is 55.

It can be divided in two parts, 2526 and 5128789, that added together give a palindrome (5131315).

The spelling of 25265128789 in words is "twenty-five billion, two hundred sixty-five million, one hundred twenty-eight thousand, seven hundred eighty-nine".