25509993289 has 48 divisors (see below), whose sum is σ = 30369665664. Its totient is φ = 21208140800.

The previous prime is 25509993287. The next prime is 25509993293. The reversal of 25509993289 is 98239990552.

It is not a de Polignac number, because 25509993289 - 2¹ = 25509993287 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25509993287) 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 47 ways as a sum of consecutive naturals, for example, 24042819 + ... + 24043879.

It is an arithmetic number, because the mean of its divisors is an integer number (632701368).

Almost surely, 2^25509993289 is an apocalyptic number.

25509993289 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

25509993289 is a deficient number, since it is larger than the sum of its proper divisors (4859672375).

25509993289 is a wasteful number, since it uses less digits than its factorization.

25509993289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1266 (or 1237 counting only the distinct ones).

The product of its (nonzero) digits is 15746400, while the sum is 61.

The spelling of 25509993289 in words is "twenty-five billion, five hundred nine million, nine hundred ninety-three thousand, two hundred eighty-nine".