25505013205 has 16 divisors (see below), whose sum is σ = 35001224064. Its totient is φ = 17477691840.

The previous prime is 25505013203. The next prime is 25505013217. The reversal of 25505013205 is 50231050552.

It is not a de Polignac number, because 25505013205 - 2¹ = 25505013203 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25505013203) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 184402 + ... + 291571.

It is an arithmetic number, because the mean of its divisors is an integer number (2187576504).

Almost surely, 2^25505013205 is an apocalyptic number.

It is an amenable number.

25505013205 is a deficient number, since it is larger than the sum of its proper divisors (9496210859).

25505013205 is a wasteful number, since it uses less digits than its factorization.

25505013205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 477516.

The product of its (nonzero) digits is 7500, while the sum is 28.

Adding to 25505013205 its reverse (50231050552), we get a palindrome (75736063757).

The spelling of 25505013205 in words is "twenty-five billion, five hundred five million, thirteen thousand, two hundred five".