25855255851 has 16 divisors (see below), whose sum is σ = 37001564064. Its totient is φ = 16000671744.

The previous prime is 25855255849. The next prime is 25855255859. The reversal of 25855255851 is 15855255852.

It is not a de Polignac number, because 25855255851 - 2¹ = 25855255849 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a junction number, because it is equal to n+sod(n) for n = 25855255794 and 25855255803.

It is not an unprimeable number, because it can be changed into a prime (25855255859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3468646 + ... + 3476091.

It is an arithmetic number, because the mean of its divisors is an integer number (2312597754).

Almost surely, 2^25855255851 is an apocalyptic number.

25855255851 is a deficient number, since it is larger than the sum of its proper divisors (11146308213).

25855255851 is a wasteful number, since it uses less digits than its factorization.

25855255851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6944830.

The product of its digits is 4000000, while the sum is 51.

Subtracting from 25855255851 its reverse (15855255852), we obtain a palindrome (9999999999).

The spelling of 25855255851 in words is "twenty-five billion, eight hundred fifty-five million, two hundred fifty-five thousand, eight hundred fifty-one".