25655178589 has 2 divisors, whose sum is σ = 25655178590. Its totient is φ = 25655178588.

The previous prime is 25655178551. The next prime is 25655178613. The reversal of 25655178589 is 98587155652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22273174564 + 3382004025 = 149242^2 + 58155^2 .

It is a cyclic number.

It is not a de Polignac number, because 25655178589 - 2¹¹ = 25655176541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25655278589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12827589294 + 12827589295.

It is an arithmetic number, because the mean of its divisors is an integer number (12827589295).

Almost surely, 2^25655178589 is an apocalyptic number.

It is an amenable number.

25655178589 is a deficient number, since it is larger than the sum of its proper divisors (1).

25655178589 is an equidigital number, since it uses as much as digits as its factorization.

25655178589 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240000, while the sum is 61.

The spelling of 25655178589 in words is "twenty-five billion, six hundred fifty-five million, one hundred seventy-eight thousand, five hundred eighty-nine".