25490996281 has 27 divisors (see below), whose sum is σ = 27006478821. Its totient is φ = 24059972664.

The previous prime is 25490996269. The next prime is 25490996287. The reversal of 25490996281 is 18269909452.

The square root of 25490996281 is 159659.

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

It is not a de Polignac number, because 25490996281 - 2⁵ = 25490996249 is a prime.

It is a super-2 number, since 2×25490996281² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25490996287) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 322670800 + ... + 322670878.

Almost surely, 2^25490996281 is an apocalyptic number.

25490996281 is the 159659-th square number.

25490996281 is the 79830-th centered octagonal number.

It is an amenable number.

25490996281 is a deficient number, since it is larger than the sum of its proper divisors (1515482540).

25490996281 is an frugal number, since it uses more digits than its factorization.

25490996281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338 (or 169 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 55.

The spelling of 25490996281 in words is "twenty-five billion, four hundred ninety million, nine hundred ninety-six thousand, two hundred eighty-one".