25257678869 has 2 divisors, whose sum is σ = 25257678870. Its totient is φ = 25257678868.

The previous prime is 25257678833. The next prime is 25257678871. The reversal of 25257678869 is 96887675252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15409498225 + 9848180644 = 124135^2 + 99238^2 .

It is a cyclic number.

It is not a de Polignac number, because 25257678869 - 2¹⁶ = 25257613333 is a prime.

It is a super-2 number, since 2×25257678869² (a number of 22 digits) contains 22 as substring.

Together with 25257678871, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25257678469) 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, 12628839434 + 12628839435.

It is an arithmetic number, because the mean of its divisors is an integer number (12628839435).

Almost surely, 2^25257678869 is an apocalyptic number.

It is an amenable number.

25257678869 is a deficient number, since it is larger than the sum of its proper divisors (1).

25257678869 is an equidigital number, since it uses as much as digits as its factorization.

25257678869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 101606400, while the sum is 65.

The spelling of 25257678869 in words is "twenty-five billion, two hundred fifty-seven million, six hundred seventy-eight thousand, eight hundred sixty-nine".