25557551851 has 16 divisors (see below), whose sum is σ = 29152484928. Its totient is φ = 22196275200.

The previous prime is 25557551821. The next prime is 25557551869. The reversal of 25557551851 is 15815575552.

It is a cyclic number.

It is not a de Polignac number, because 25557551851 - 2⁵ = 25557551819 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25557551795 and 25557551804.

It is not an unprimeable number, because it can be changed into a prime (25557551821) 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, 687091 + ... + 723331.

It is an arithmetic number, because the mean of its divisors is an integer number (1822030308).

Almost surely, 2^25557551851 is an apocalyptic number.

25557551851 is a deficient number, since it is larger than the sum of its proper divisors (3594933077).

25557551851 is a wasteful number, since it uses less digits than its factorization.

25557551851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39462.

The product of its digits is 1750000, while the sum is 49.

The spelling of 25557551851 in words is "twenty-five billion, five hundred fifty-seven million, five hundred fifty-one thousand, eight hundred fifty-one".