25599999999 has 32 divisors (see below), whose sum is σ = 41165314560. Its totient is φ = 13824000000.

The previous prime is 25599999977. The next prime is 25600000039. The reversal of 25599999999 is 99999999552.

It is a Cunningham number, because it is equal to 20⁸-1.

It is not a de Polignac number, because 25599999999 - 2¹⁶ = 25599934463 is a prime.

25599999999 is a modest number, since divided by 999999 gives 25599 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25599999949) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 79999 + ... + 239999.

It is an arithmetic number, because the mean of its divisors is an integer number (1286416080).

Almost surely, 2^25599999999 is an apocalyptic number.

25599999999 is a deficient number, since it is larger than the sum of its proper divisors (15565314561).

25599999999 is a wasteful number, since it uses less digits than its factorization.

25599999999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160431.

The product of its digits is 2152336050, while the sum is 84.

The spelling of 25599999999 in words is "twenty-five billion, five hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".