25405135256129 has 2 divisors, whose sum is σ = 25405135256130. Its totient is φ = 25405135256128.

The previous prime is 25405135256113. The next prime is 25405135256147. The reversal of 25405135256129 is 92165253150452.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13369092766129 + 12036042490000 = 3656377^2 + 3469300^2 .

It is a cyclic number.

It is not a de Polignac number, because 25405135256129 - 2⁴ = 25405135256113 is a prime.

It is not a weakly prime, because it can be changed into another prime (25405135256159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12702567628064 + 12702567628065.

It is an arithmetic number, because the mean of its divisors is an integer number (12702567628065).

Almost surely, 2^{25405135256129} is an apocalyptic number.

It is an amenable number.

25405135256129 is a deficient number, since it is larger than the sum of its proper divisors (1).

25405135256129 is an equidigital number, since it uses as much as digits as its factorization.

25405135256129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240000, while the sum is 50.

The spelling of 25405135256129 in words is "twenty-five trillion, four hundred five billion, one hundred thirty-five million, two hundred fifty-six thousand, one hundred twenty-nine".