25528278052489 has 2 divisors, whose sum is σ = 25528278052490. Its totient is φ = 25528278052488.

The previous prime is 25528278052483. The next prime is 25528278052643. The reversal of 25528278052489 is 98425087282552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24773594926864 + 754683125625 = 4977308^2 + 868725^2 .

It is a cyclic number.

It is not a de Polignac number, because 25528278052489 - 2³ = 25528278052481 is a prime.

It is not a weakly prime, because it can be changed into another prime (25528278052481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12764139026244 + 12764139026245.

It is an arithmetic number, because the mean of its divisors is an integer number (12764139026245).

Almost surely, 2^{25528278052489} is an apocalyptic number.

It is an amenable number.

25528278052489 is a deficient number, since it is larger than the sum of its proper divisors (1).

25528278052489 is an equidigital number, since it uses as much as digits as its factorization.

25528278052489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 258048000, while the sum is 67.

The spelling of 25528278052489 in words is "twenty-five trillion, five hundred twenty-eight billion, two hundred seventy-eight million, fifty-two thousand, four hundred eighty-nine".