25664507641 has 16 divisors (see below), whose sum is σ = 26633154240. Its totient is φ = 24713579520.

The previous prime is 25664507587. The next prime is 25664507647. The reversal of 25664507641 is 14670546652.

It is a cyclic number.

It is not a de Polignac number, because 25664507641 - 2⁷ = 25664507513 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25664507591 and 25664507600.

It is not an unprimeable number, because it can be changed into a prime (25664507647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1498770 + ... + 1515796.

It is an arithmetic number, because the mean of its divisors is an integer number (1664572140).

Almost surely, 2^25664507641 is an apocalyptic number.

It is an amenable number.

25664507641 is a deficient number, since it is larger than the sum of its proper divisors (968646599).

25664507641 is a wasteful number, since it uses less digits than its factorization.

25664507641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17544.

The product of its (nonzero) digits is 1209600, while the sum is 46.

The spelling of 25664507641 in words is "twenty-five billion, six hundred sixty-four million, five hundred seven thousand, six hundred forty-one".