25425259209 has 45 divisors (see below), whose sum is σ = 44199376221. Its totient is φ = 14522979240.

The previous prime is 25425259199. The next prime is 25425259217. The reversal of 25425259209 is 90295252452.

The square root of 25425259209 is 159453.

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

25425259209 is a `hidden beast` number, since 2 + 5 + 4 + 2 + 52 + 592 + 0 + 9 = 666.

It is not a de Polignac number, because 25425259209 - 2²³ = 25416870601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25425259229) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 10044274 + ... + 10046804.

Almost surely, 2^25425259209 is an apocalyptic number.

25425259209 is the 159453-rd square number.

25425259209 is the 79727-th centered octagonal number.

It is an amenable number.

25425259209 is a deficient number, since it is larger than the sum of its proper divisors (18774117012).

25425259209 is an frugal number, since it uses more digits than its factorization.

25425259209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5088 (or 2541 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 45.

The spelling of 25425259209 in words is "twenty-five billion, four hundred twenty-five million, two hundred fifty-nine thousand, two hundred nine".