25923898081 has 3 divisors (see below), whose sum is σ = 25924059091. Its totient is φ = 25923737072.

The previous prime is 25923898079. The next prime is 25923898123. The reversal of 25923898081 is 18089832952.

It is a happy number.

The square root of 25923898081 is 161009.

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 can be written as a sum of positive squares in only one way, i.e., 170067681 + 25753830400 = 13041^2 + 160480^2 .

It is not a de Polignac number, because 25923898081 - 2¹ = 25923898079 is a prime.

It is a super-2 number, since 2×25923898081² (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 (25923898031) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 80505 + ... + 241513.

Almost surely, 2^25923898081 is an apocalyptic number.

25923898081 is the 161009-th square number.

25923898081 is the 80505-th centered octagonal number.

It is an amenable number.

25923898081 is a deficient number, since it is larger than the sum of its proper divisors (161010).

25923898081 is an frugal number, since it uses more digits than its factorization.

25923898081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322018 (or 161009 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 55.

The spelling of 25923898081 in words is "twenty-five billion, nine hundred twenty-three million, eight hundred ninety-eight thousand, eighty-one".