25629128281 has 3 divisors (see below), whose sum is σ = 25629288373. Its totient is φ = 25628968190.

The previous prime is 25629128269. The next prime is 25629128297. The reversal of 25629128281 is 18282192652.

The square root of 25629128281 is 160091.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 25629128281 - 2¹⁹ = 25628603993 is a prime.

It is a super-2 number, since 2×25629128281² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25629128251) 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 2 ways as a sum of consecutive naturals, for example, 80046 + ... + 240136.

Almost surely, 2^25629128281 is an apocalyptic number.

25629128281 is the 160091-st square number.

25629128281 is the 80046-th centered octagonal number.

It is an amenable number.

25629128281 is a deficient number, since it is larger than the sum of its proper divisors (160092).

25629128281 is an frugal number, since it uses more digits than its factorization.

25629128281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320182 (or 160091 counting only the distinct ones).

The product of its digits is 276480, while the sum is 46.

The spelling of 25629128281 in words is "twenty-five billion, six hundred twenty-nine million, one hundred twenty-eight thousand, two hundred eighty-one".