25878878869 has 2 divisors, whose sum is σ = 25878878870. Its totient is φ = 25878878868.

The previous prime is 25878878761. The next prime is 25878878887. The reversal of 25878878869 is 96887887852.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25189816369 + 689062500 = 158713^2 + 26250^2 .

It is a cyclic number.

It is not a de Polignac number, because 25878878869 - 2²⁷ = 25744661141 is a prime.

It is a super-2 number, since 2×25878878869² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25878878795 and 25878878804.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25878828869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12939439434 + 12939439435.

It is an arithmetic number, because the mean of its divisors is an integer number (12939439435).

Almost surely, 2^25878878869 is an apocalyptic number.

It is an amenable number.

25878878869 is a deficient number, since it is larger than the sum of its proper divisors (1).

25878878869 is an equidigital number, since it uses as much as digits as its factorization.

25878878869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 867041280, while the sum is 76.

The spelling of 25878878869 in words is "twenty-five billion, eight hundred seventy-eight million, eight hundred seventy-eight thousand, eight hundred sixty-nine".