25689778511 has 2 divisors, whose sum is σ = 25689778512. Its totient is φ = 25689778510.

The previous prime is 25689778481. The next prime is 25689778619. The reversal of 25689778511 is 11587798652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25689778511 - 2¹⁴ = 25689762127 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25689778111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12844889255 + 12844889256.

It is an arithmetic number, because the mean of its divisors is an integer number (12844889256).

Almost surely, 2^25689778511 is an apocalyptic number.

25689778511 is a deficient number, since it is larger than the sum of its proper divisors (1).

25689778511 is an equidigital number, since it uses as much as digits as its factorization.

25689778511 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8467200, while the sum is 59.

The spelling of 25689778511 in words is "twenty-five billion, six hundred eighty-nine million, seven hundred seventy-eight thousand, five hundred eleven".