25965594643 has 4 divisors (see below), whose sum is σ = 25986385000. Its totient is φ = 25944804288.

The previous prime is 25965594583. The next prime is 25965594649. The reversal of 25965594643 is 34649556952.

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 25965594643 - 2⁹ = 25965594131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25965594649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10393305 + ... + 10395802.

It is an arithmetic number, because the mean of its divisors is an integer number (6496596250).

Almost surely, 2^25965594643 is an apocalyptic number.

25965594643 is a deficient number, since it is larger than the sum of its proper divisors (20790357).

25965594643 is a wasteful number, since it uses less digits than its factorization.

25965594643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20790356.

The product of its digits is 34992000, while the sum is 58.

The spelling of 25965594643 in words is "twenty-five billion, nine hundred sixty-five million, five hundred ninety-four thousand, six hundred forty-three".