25257678469 has 2 divisors, whose sum is σ = 25257678470. Its totient is φ = 25257678468.

The previous prime is 25257678421. The next prime is 25257678487. The reversal of 25257678469 is 96487675252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24755246244 + 502432225 = 157338^2 + 22415^2 .

It is a cyclic number.

It is not a de Polignac number, because 25257678469 - 2⁹ = 25257677957 is a prime.

It is a super-2 number, since 2×25257678469² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25257678769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12628839234 + 12628839235.

It is an arithmetic number, because the mean of its divisors is an integer number (12628839235).

Almost surely, 2^25257678469 is an apocalyptic number.

It is an amenable number.

25257678469 is a deficient number, since it is larger than the sum of its proper divisors (1).

25257678469 is an equidigital number, since it uses as much as digits as its factorization.

25257678469 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50803200, while the sum is 61.

The spelling of 25257678469 in words is "twenty-five billion, two hundred fifty-seven million, six hundred seventy-eight thousand, four hundred sixty-nine".