25861307513 has 2 divisors, whose sum is σ = 25861307514. Its totient is φ = 25861307512.

The previous prime is 25861307503. The next prime is 25861307533. The reversal of 25861307513 is 31570316852.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23131976464 + 2729331049 = 152092^2 + 52243^2 .

It is a cyclic number.

It is not a de Polignac number, because 25861307513 - 2⁴ = 25861307497 is a prime.

It is not a weakly prime, because it can be changed into another prime (25861307503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12930653756 + 12930653757.

It is an arithmetic number, because the mean of its divisors is an integer number (12930653757).

Almost surely, 2^25861307513 is an apocalyptic number.

It is an amenable number.

25861307513 is a deficient number, since it is larger than the sum of its proper divisors (1).

25861307513 is an equidigital number, since it uses as much as digits as its factorization.

25861307513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 151200, while the sum is 41.

The spelling of 25861307513 in words is "twenty-five billion, eight hundred sixty-one million, three hundred seven thousand, five hundred thirteen".