25005509999 has 2 divisors, whose sum is σ = 25005510000. Its totient is φ = 25005509998.

The previous prime is 25005509917. The next prime is 25005510017. The reversal of 25005509999 is 99990550052.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25005509999 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25005509999.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25005509299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12502754999 + 12502755000.

It is an arithmetic number, because the mean of its divisors is an integer number (12502755000).

Almost surely, 2^25005509999 is an apocalyptic number.

25005509999 is a deficient number, since it is larger than the sum of its proper divisors (1).

25005509999 is an equidigital number, since it uses as much as digits as its factorization.

25005509999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1640250, while the sum is 53.

The spelling of 25005509999 in words is "twenty-five billion, five million, five hundred nine thousand, nine hundred ninety-nine".