25581428321 has 8 divisors (see below), whose sum is σ = 25974748800. Its totient is φ = 25188446448.

The previous prime is 25581428269. The next prime is 25581428347. The reversal of 25581428321 is 12382418552.

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

It is a cyclic number.

It is not a de Polignac number, because 25581428321 - 2²² = 25577234017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25581425321) 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, 69755 + ... + 236703.

It is an arithmetic number, because the mean of its divisors is an integer number (3246843600).

Almost surely, 2^25581428321 is an apocalyptic number.

It is an amenable number.

25581428321 is a deficient number, since it is larger than the sum of its proper divisors (393320479).

25581428321 is a wasteful number, since it uses less digits than its factorization.

25581428321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169303.

The product of its digits is 153600, while the sum is 41.

The spelling of 25581428321 in words is "twenty-five billion, five hundred eighty-one million, four hundred twenty-eight thousand, three hundred twenty-one".