25885874869 has 2 divisors, whose sum is σ = 25885874870. Its totient is φ = 25885874868.

The previous prime is 25885874863. The next prime is 25885874921. The reversal of 25885874869 is 96847858852.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22368791844 + 3517083025 = 149562^2 + 59305^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25885874869 is a prime.

It is a super-2 number, since 2×25885874869² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25885874798 and 25885874807.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25885874863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12942937434 + 12942937435.

It is an arithmetic number, because the mean of its divisors is an integer number (12942937435).

Almost surely, 2^25885874869 is an apocalyptic number.

It is an amenable number.

25885874869 is a deficient number, since it is larger than the sum of its proper divisors (1).

25885874869 is an equidigital number, since it uses as much as digits as its factorization.

25885874869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 309657600, while the sum is 70.

The spelling of 25885874869 in words is "twenty-five billion, eight hundred eighty-five million, eight hundred seventy-four thousand, eight hundred sixty-nine".