25791280205 has 6 divisors (see below), whose sum is σ = 30949967178. Its totient is φ = 20632736880.

The previous prime is 25791280189. The next prime is 25791280213. The reversal of 25791280205 is 50208219752.

It can be written as a sum of positive squares in 3 ways, for example, as 5049807844 + 20741472361 = 71062^2 + 144019^2 .

It is not a de Polignac number, because 25791280205 - 2⁴ = 25791280189 is a prime.

It is a super-2 number, since 2×25791280205² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 323195 + ... + 395015.

It is an arithmetic number, because the mean of its divisors is an integer number (5158327863).

Almost surely, 2^25791280205 is an apocalyptic number.

It is an amenable number.

25791280205 is a deficient number, since it is larger than the sum of its proper divisors (5158686973).

25791280205 is an frugal number, since it uses more digits than its factorization.

25791280205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143647 (or 71826 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 41.

Adding to 25791280205 its reverse (50208219752), we get a palindrome (75999499957).

The spelling of 25791280205 in words is "twenty-five billion, seven hundred ninety-one million, two hundred eighty thousand, two hundred five".