25961039999 has 4 divisors (see below), whose sum is σ = 26038076064. Its totient is φ = 25884003936.

The previous prime is 25961039989. The next prime is 25961040019. The reversal of 25961039999 is 99993016952.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25961039999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25961039969) 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 3 ways as a sum of consecutive naturals, for example, 38517527 + ... + 38518200.

It is an arithmetic number, because the mean of its divisors is an integer number (6509519016).

Almost surely, 2^25961039999 is an apocalyptic number.

25961039999 is a deficient number, since it is larger than the sum of its proper divisors (77036065).

25961039999 is an equidigital number, since it uses as much as digits as its factorization.

25961039999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77036064.

The product of its (nonzero) digits is 10628820, while the sum is 62.

The spelling of 25961039999 in words is "twenty-five billion, nine hundred sixty-one million, thirty-nine thousand, nine hundred ninety-nine".