25998642603 has 16 divisors (see below), whose sum is σ = 38897863200. Its totient is φ = 17160818400.

The previous prime is 25998642599. The next prime is 25998642611. The reversal of 25998642603 is 30624689952.

It is a happy number.

25998642603 is a `hidden beast` number, since 2 + 599 + 8 + 6 + 42 + 6 + 0 + 3 = 666.

It is not a de Polignac number, because 25998642603 - 2² = 25998642599 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25998642603.

It is not an unprimeable number, because it can be changed into a prime (25998642653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4764168 + ... + 4769621.

It is an arithmetic number, because the mean of its divisors is an integer number (2431116450).

Almost surely, 2^25998642603 is an apocalyptic number.

25998642603 is a deficient number, since it is larger than the sum of its proper divisors (12899220597).

25998642603 is a wasteful number, since it uses less digits than its factorization.

25998642603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9533899 (or 9533893 counting only the distinct ones).

The product of its (nonzero) digits is 5598720, while the sum is 54.

The spelling of 25998642603 in words is "twenty-five billion, nine hundred ninety-eight million, six hundred forty-two thousand, six hundred three".