25642735409 has 8 divisors (see below), whose sum is σ = 25924708320. Its totient is φ = 25361122176.

The previous prime is 25642735379. The next prime is 25642735463. The reversal of 25642735409 is 90453724652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25642735409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25642735109) 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 7 ways as a sum of consecutive naturals, for example, 54722 + ... + 232980.

It is an arithmetic number, because the mean of its divisors is an integer number (3240588540).

Almost surely, 2^25642735409 is an apocalyptic number.

It is an amenable number.

25642735409 is a deficient number, since it is larger than the sum of its proper divisors (281972911).

25642735409 is a wasteful number, since it uses less digits than its factorization.

25642735409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179839.

The product of its (nonzero) digits is 1814400, while the sum is 47.

The spelling of 25642735409 in words is "twenty-five billion, six hundred forty-two million, seven hundred thirty-five thousand, four hundred nine".