25404128887 has 2 divisors, whose sum is σ = 25404128888. Its totient is φ = 25404128886.

The previous prime is 25404128873. The next prime is 25404128917. The reversal of 25404128887 is 78882140452.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25404128887 - 2²⁷ = 25269911159 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25404128887.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25404128807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12702064443 + 12702064444.

It is an arithmetic number, because the mean of its divisors is an integer number (12702064444).

Almost surely, 2^25404128887 is an apocalyptic number.

25404128887 is a deficient number, since it is larger than the sum of its proper divisors (1).

25404128887 is an equidigital number, since it uses as much as digits as its factorization.

25404128887 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1146880, while the sum is 49.

The spelling of 25404128887 in words is "twenty-five billion, four hundred four million, one hundred twenty-eight thousand, eight hundred eighty-seven".