25997599249 has 8 divisors (see below), whose sum is σ = 26226184320. Its totient is φ = 25769882496.

The previous prime is 25997599241. The next prime is 25997599261. The reversal of 25997599249 is 94299579952.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25997599249 - 2³ = 25997599241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25997599241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 156864 + ... + 276769.

It is an arithmetic number, because the mean of its divisors is an integer number (3278273040).

Almost surely, 2^25997599249 is an apocalyptic number.

It is an amenable number.

25997599249 is a deficient number, since it is larger than the sum of its proper divisors (228585071).

25997599249 is a wasteful number, since it uses less digits than its factorization.

25997599249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434159.

The product of its digits is 165337200, while the sum is 70.

The spelling of 25997599249 in words is "twenty-five billion, nine hundred ninety-seven million, five hundred ninety-nine thousand, two hundred forty-nine".