25318655449 has 16 divisors (see below), whose sum is σ = 25659627840. Its totient is φ = 24980417280.

The previous prime is 25318655443. The next prime is 25318655471. The reversal of 25318655449 is 94455681352.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 25318655449 - 2¹⁷ = 25318524377 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25318655396 and 25318655405.

It is not an unprimeable number, because it can be changed into a prime (25318655443) 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 15 ways as a sum of consecutive naturals, for example, 27020509 + ... + 27021445.

It is an arithmetic number, because the mean of its divisors is an integer number (1603726740).

Almost surely, 2^25318655449 is an apocalyptic number.

It is an amenable number.

25318655449 is a deficient number, since it is larger than the sum of its proper divisors (340972391).

25318655449 is a wasteful number, since it uses less digits than its factorization.

25318655449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2040.

The product of its digits is 5184000, while the sum is 52.

The spelling of 25318655449 in words is "twenty-five billion, three hundred eighteen million, six hundred fifty-five thousand, four hundred forty-nine".