25685983449 has 48 divisors (see below), whose sum is σ = 42987110400. Its totient is φ = 14475678048.

The previous prime is 25685983423. The next prime is 25685983459. The reversal of 25685983449 is 94438958652.

25685983449 is a `hidden beast` number, since 2 + 5 + 6 + 8 + 598 + 34 + 4 + 9 = 666.

It is not a de Polignac number, because 25685983449 - 2¹⁵ = 25685950681 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (25685983459) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5487292 + ... + 5491970.

It is an arithmetic number, because the mean of its divisors is an integer number (895564800).

Almost surely, 2^25685983449 is an apocalyptic number.

It is an amenable number.

25685983449 is a deficient number, since it is larger than the sum of its proper divisors (17301126951).

25685983449 is a wasteful number, since it uses less digits than its factorization.

25685983449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5874 (or 5871 counting only the distinct ones).

The product of its digits is 74649600, while the sum is 63.

The spelling of 25685983449 in words is "twenty-five billion, six hundred eighty-five million, nine hundred eighty-three thousand, four hundred forty-nine".