25805866663 has 16 divisors (see below), whose sum is σ = 26411374080. Its totient is φ = 25207300800.

The previous prime is 25805866661. The next prime is 25805866693. The reversal of 25805866663 is 36666850852.

It is a cyclic number.

It is not a de Polignac number, because 25805866663 - 2¹ = 25805866661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25805866661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13791618 + ... + 13793488.

It is an arithmetic number, because the mean of its divisors is an integer number (1650710880).

Almost surely, 2^25805866663 is an apocalyptic number.

25805866663 is a deficient number, since it is larger than the sum of its proper divisors (605507417).

25805866663 is a wasteful number, since it uses less digits than its factorization.

25805866663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3558.

The product of its (nonzero) digits is 12441600, while the sum is 55.

The spelling of 25805866663 in words is "twenty-five billion, eight hundred five million, eight hundred sixty-six thousand, six hundred sixty-three".