25253635251 has 16 divisors (see below), whose sum is σ = 36720642560. Its totient is φ = 15343979040.

The previous prime is 25253635241. The next prime is 25253635273. The reversal of 25253635251 is 15253635252.

It is a happy number.

It is not a de Polignac number, because 25253635251 - 2¹⁰ = 25253634227 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25253635241) 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, 4095205 + ... + 4101366.

It is an arithmetic number, because the mean of its divisors is an integer number (2295040160).

Almost surely, 2^25253635251 is an apocalyptic number.

25253635251 is a deficient number, since it is larger than the sum of its proper divisors (11467007309).

25253635251 is a wasteful number, since it uses less digits than its factorization.

25253635251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8196666.

The product of its digits is 270000, while the sum is 39.

Subtracting from 25253635251 its reverse (15253635252), we obtain a palindrome (9999999999).

The spelling of 25253635251 in words is "twenty-five billion, two hundred fifty-three million, six hundred thirty-five thousand, two hundred fifty-one".