25782055581 has 8 divisors (see below), whose sum is σ = 35305157344. Its totient is φ = 16723495440.

The previous prime is 25782055549. The next prime is 25782055583. The reversal of 25782055581 is 18555028752.

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

It is not a de Polignac number, because 25782055581 - 2⁵ = 25782055549 is a prime.

It is a super-2 number, since 2×25782055581² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 25782055581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25782055583) 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 7 ways as a sum of consecutive naturals, for example, 116135275 + ... + 116135496.

It is an arithmetic number, because the mean of its divisors is an integer number (4413144668).

Almost surely, 2^25782055581 is an apocalyptic number.

It is an amenable number.

25782055581 is a deficient number, since it is larger than the sum of its proper divisors (9523101763).

25782055581 is a wasteful number, since it uses less digits than its factorization.

25782055581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232270811.

The product of its (nonzero) digits is 1120000, while the sum is 48.

The spelling of 25782055581 in words is "twenty-five billion, seven hundred eighty-two million, fifty-five thousand, five hundred eighty-one".