25565505139 has 2 divisors, whose sum is σ = 25565505140. Its totient is φ = 25565505138.

The previous prime is 25565505109. The next prime is 25565505179. The reversal of 25565505139 is 93150556552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25565505139 - 2⁵ = 25565505107 is a prime.

It is not a weakly prime, because it can be changed into another prime (25565505109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12782752569 + 12782752570.

It is an arithmetic number, because the mean of its divisors is an integer number (12782752570).

Almost surely, 2^25565505139 is an apocalyptic number.

25565505139 is a deficient number, since it is larger than the sum of its proper divisors (1).

25565505139 is an equidigital number, since it uses as much as digits as its factorization.

25565505139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1012500, while the sum is 46.

The spelling of 25565505139 in words is "twenty-five billion, five hundred sixty-five million, five hundred five thousand, one hundred thirty-nine".