25650905281 has 3 divisors (see below), whose sum is σ = 25651065441. Its totient is φ = 25650745122.

The previous prime is 25650905279. The next prime is 25650905327. The reversal of 25650905281 is 18250905652.

The square root of 25650905281 is 160159.

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 25650905281 - 2¹ = 25650905279 is a prime.

It is a super-2 number, since 2×25650905281² (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 (25650905201) 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 2 ways as a sum of consecutive naturals, for example, 80080 + ... + 240238.

It is an arithmetic number, because the mean of its divisors is an integer number (8550355147).

Almost surely, 2^25650905281 is an apocalyptic number.

25650905281 is the 160159-th square number.

25650905281 is the 80080-th centered octagonal number.

It is an amenable number.

25650905281 is a deficient number, since it is larger than the sum of its proper divisors (160160).

25650905281 is an frugal number, since it uses more digits than its factorization.

25650905281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320318 (or 160159 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 43.

The spelling of 25650905281 in words is "twenty-five billion, six hundred fifty million, nine hundred five thousand, two hundred eighty-one".