25406566543 has 16 divisors (see below), whose sum is σ = 25767383040. Its totient is φ = 25049068000.

The previous prime is 25406566531. The next prime is 25406566561. The reversal of 25406566543 is 34566560452.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25406566543 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25406566493 and 25406566502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25406566573) 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 15 ways as a sum of consecutive naturals, for example, 13363893 + ... + 13365793.

It is an arithmetic number, because the mean of its divisors is an integer number (1610461440).

Almost surely, 2^25406566543 is an apocalyptic number.

25406566543 is a deficient number, since it is larger than the sum of its proper divisors (360816497).

25406566543 is a wasteful number, since it uses less digits than its factorization.

25406566543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2678.

The product of its (nonzero) digits is 2592000, while the sum is 46.

The spelling of 25406566543 in words is "twenty-five billion, four hundred six million, five hundred sixty-six thousand, five hundred forty-three".