25646000043 has 6 divisors (see below), whose sum is σ = 34195036564. Its totient is φ = 17097148444.

The previous prime is 25645999993. The next prime is 25646000047. The reversal of 25646000043 is 34000064652.

It is not a de Polignac number, because 25646000043 - 2²¹ = 25643902891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25646000047) 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 5 ways as a sum of consecutive naturals, for example, 231148 + ... + 323606.

Almost surely, 2^25646000043 is an apocalyptic number.

25646000043 is a deficient number, since it is larger than the sum of its proper divisors (8549036521).

25646000043 is an frugal number, since it uses more digits than its factorization.

25646000043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184921 (or 92462 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 30.

Adding to 25646000043 its reverse (34000064652), we get a palindrome (59646064695).

The spelling of 25646000043 in words is "twenty-five billion, six hundred forty-six million, forty-three", and thus it is an aban number.