25513308145 has 16 divisors (see below), whose sum is σ = 33010886160. Its totient is φ = 18817830144.

The previous prime is 25513308137. The next prime is 25513308157. The reversal of 25513308145 is 54180331552.

It can be written as a sum of positive squares in 8 ways, for example, as 8266264561 + 17247043584 = 90919^2 + 131328^2 .

It is a cyclic number.

It is not a de Polignac number, because 25513308145 - 2³ = 25513308137 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 182854 + ... + 290623.

It is an arithmetic number, because the mean of its divisors is an integer number (2063180385).

Almost surely, 2^25513308145 is an apocalyptic number.

It is an amenable number.

25513308145 is a deficient number, since it is larger than the sum of its proper divisors (7497578015).

25513308145 is a wasteful number, since it uses less digits than its factorization.

25513308145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474324.

The product of its (nonzero) digits is 72000, while the sum is 37.

Adding to 25513308145 its reverse (54180331552), we get a palindrome (79693639697).

The spelling of 25513308145 in words is "twenty-five billion, five hundred thirteen million, three hundred eight thousand, one hundred forty-five".