25911991241 has 18 divisors (see below), whose sum is σ = 26613314910. Its totient is φ = 25225939200.

The previous prime is 25911991213. The next prime is 25911991271. The reversal of 25911991241 is 14219911952.

It can be written as a sum of positive squares in 3 ways, for example, as 4414273600 + 21497717641 = 66440^2 + 146621^2 .

It is not a de Polignac number, because 25911991241 - 2⁶ = 25911991177 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25911991192 and 25911991201.

It is not an unprimeable number, because it can be changed into a prime (25911991271) 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 17 ways as a sum of consecutive naturals, for example, 171602516 + ... + 171602666.

It is an arithmetic number, because the mean of its divisors is an integer number (1478517495).

Almost surely, 2^25911991241 is an apocalyptic number.

It is an amenable number.

25911991241 is a deficient number, since it is larger than the sum of its proper divisors (701323669).

25911991241 is an frugal number, since it uses more digits than its factorization.

25911991241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 617 (or 353 counting only the distinct ones).

The product of its digits is 58320, while the sum is 44.

The spelling of 25911991241 in words is "twenty-five billion, nine hundred eleven million, nine hundred ninety-one thousand, two hundred forty-one".