25689857187469 has 2 divisors, whose sum is σ = 25689857187470. Its totient is φ = 25689857187468.

The previous prime is 25689857187439. The next prime is 25689857187487. The reversal of 25689857187469 is 96478175898652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25669675575625 + 20181611844 = 5066525^2 + 142062^2 .

It is a cyclic number.

It is not a de Polignac number, because 25689857187469 - 2⁷ = 25689857187341 is a prime.

It is a super-2 number, since 2×25689857187469² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25689857187419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12844928593734 + 12844928593735.

It is an arithmetic number, because the mean of its divisors is an integer number (12844928593735).

Almost surely, 2^{25689857187469} is an apocalyptic number.

It is an amenable number.

25689857187469 is a deficient number, since it is larger than the sum of its proper divisors (1).

25689857187469 is an equidigital number, since it uses as much as digits as its factorization.

25689857187469 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14631321600, while the sum is 85.

The spelling of 25689857187469 in words is "twenty-five trillion, six hundred eighty-nine billion, eight hundred fifty-seven million, one hundred eighty-seven thousand, four hundred sixty-nine".