26257280129 has 2 divisors, whose sum is σ = 26257280130. Its totient is φ = 26257280128.

The previous prime is 26257280117. The next prime is 26257280131. The reversal of 26257280129 is 92108275262.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24719071729 + 1538208400 = 157223^2 + 39220^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26257280129 is a prime.

Together with 26257280131, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 26257280129.

It is not a weakly prime, because it can be changed into another prime (26257280629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13128640064 + 13128640065.

It is an arithmetic number, because the mean of its divisors is an integer number (13128640065).

Almost surely, 2^26257280129 is an apocalyptic number.

It is an amenable number.

26257280129 is a deficient number, since it is larger than the sum of its proper divisors (1).

26257280129 is an equidigital number, since it uses as much as digits as its factorization.

26257280129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 241920, while the sum is 44.

The spelling of 26257280129 in words is "twenty-six billion, two hundred fifty-seven million, two hundred eighty thousand, one hundred twenty-nine".