25305220305 has 12 divisors (see below), whose sum is σ = 43862381940. Its totient is φ = 13496117472.

The previous prime is 25305220247. The next prime is 25305220313. The reversal of 25305220305 is 50302250352.

It can be written as a sum of positive squares in 2 ways, for example, as 2743978689 + 22561241616 = 52383^2 + 150204^2 .

It is not a de Polignac number, because 25305220305 - 2¹⁰ = 25305219281 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 281169070 + ... + 281169159.

It is an arithmetic number, because the mean of its divisors is an integer number (3655198495).

Almost surely, 2^25305220305 is an apocalyptic number.

It is an amenable number.

25305220305 is a deficient number, since it is larger than the sum of its proper divisors (18557161635).

25305220305 is a wasteful number, since it uses less digits than its factorization.

25305220305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 562338240 (or 562338237 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 27.

Adding to 25305220305 its reverse (50302250352), we get a palindrome (75607470657).

The spelling of 25305220305 in words is "twenty-five billion, three hundred five million, two hundred twenty thousand, three hundred five".