25649041439 has 4 divisors (see below), whose sum is σ = 29313190224. Its totient is φ = 21984892656.

The previous prime is 25649041427. The next prime is 25649041471. The reversal of 25649041439 is 93414094652.

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

It is a cyclic number.

It is not a de Polignac number, because 25649041439 - 2¹² = 25649037343 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25649041393 and 25649041402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25649044439) 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 3 ways as a sum of consecutive naturals, for example, 1832074382 + ... + 1832074395.

It is an arithmetic number, because the mean of its divisors is an integer number (7328297556).

Almost surely, 2^25649041439 is an apocalyptic number.

25649041439 is a deficient number, since it is larger than the sum of its proper divisors (3664148785).

25649041439 is an equidigital number, since it uses as much as digits as its factorization.

25649041439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3664148784.

The product of its (nonzero) digits is 933120, while the sum is 47.

The spelling of 25649041439 in words is "twenty-five billion, six hundred forty-nine million, forty-one thousand, four hundred thirty-nine".