25543034551 has 4 divisors (see below), whose sum is σ = 25975967400. Its totient is φ = 25110101704.

The previous prime is 25543034527. The next prime is 25543034557. The reversal of 25543034551 is 15543034552.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25543034551 - 2⁹ = 25543034039 is a prime.

It is a super-2 number, since 2×25543034551² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25543034551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25543034557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 216466336 + ... + 216466453.

It is an arithmetic number, because the mean of its divisors is an integer number (6493991850).

Almost surely, 2^25543034551 is an apocalyptic number.

25543034551 is a deficient number, since it is larger than the sum of its proper divisors (432932849).

25543034551 is an equidigital number, since it uses as much as digits as its factorization.

25543034551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432932848.

The product of its (nonzero) digits is 180000, while the sum is 37.

Subtracting from 25543034551 its reverse (15543034552), we obtain a palindrome (9999999999).

The spelling of 25543034551 in words is "twenty-five billion, five hundred forty-three million, thirty-four thousand, five hundred fifty-one".