25864560643 has 8 divisors (see below), whose sum is σ = 25978604400. Its totient is φ = 25750692768.

The previous prime is 25864560637. The next prime is 25864560727. The reversal of 25864560643 is 34606546852.

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-25864560643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25864560613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 255253 + ... + 341881.

It is an arithmetic number, because the mean of its divisors is an integer number (3247325550).

Almost surely, 2^25864560643 is an apocalyptic number.

25864560643 is a deficient number, since it is larger than the sum of its proper divisors (114043757).

25864560643 is a wasteful number, since it uses less digits than its factorization.

25864560643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87941.

The product of its (nonzero) digits is 4147200, while the sum is 49.

The spelling of 25864560643 in words is "twenty-five billion, eight hundred sixty-four million, five hundred sixty thousand, six hundred forty-three".