25525505305 has 4 divisors (see below), whose sum is σ = 30630606372. Its totient is φ = 20420404240.

The previous prime is 25525505233. The next prime is 25525505311. The reversal of 25525505305 is 50350552552.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12196110096 + 13329395209 = 110436^2 + 115453^2 .

It is not a de Polignac number, because 25525505305 - 2¹⁷ = 25525374233 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 2552550526 + ... + 2552550535.

It is an arithmetic number, because the mean of its divisors is an integer number (7657651593).

Almost surely, 2^25525505305 is an apocalyptic number.

It is an amenable number.

25525505305 is a deficient number, since it is larger than the sum of its proper divisors (5105101067).

25525505305 is an equidigital number, since it uses as much as digits as its factorization.

25525505305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5105101066.

The product of its (nonzero) digits is 187500, while the sum is 37.

The spelling of 25525505305 in words is "twenty-five billion, five hundred twenty-five million, five hundred five thousand, three hundred five".