25799850613 has 2 divisors, whose sum is σ = 25799850614. Its totient is φ = 25799850612.

The previous prime is 25799850581. The next prime is 25799850617. The reversal of 25799850613 is 31605899752.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23767463889 + 2032386724 = 154167^2 + 45082^2 .

It is a cyclic number.

It is not a de Polignac number, because 25799850613 - 2⁵ = 25799850581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25799850617) 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, 12899925306 + 12899925307.

It is an arithmetic number, because the mean of its divisors is an integer number (12899925307).

Almost surely, 2^25799850613 is an apocalyptic number.

It is an amenable number.

25799850613 is a deficient number, since it is larger than the sum of its proper divisors (1).

25799850613 is an equidigital number, since it uses as much as digits as its factorization.

25799850613 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4082400, while the sum is 55.

The spelling of 25799850613 in words is "twenty-five billion, seven hundred ninety-nine million, eight hundred fifty thousand, six hundred thirteen".