25405500543 has 4 divisors (see below), whose sum is σ = 33874000728. Its totient is φ = 16937000360.

The previous prime is 25405500529. The next prime is 25405500611. The reversal of 25405500543 is 34500550452.

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 25405500543 - 2⁹ = 25405500031 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25405500503) 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, 4234250088 + ... + 4234250093.

It is an arithmetic number, because the mean of its divisors is an integer number (8468500182).

Almost surely, 2^25405500543 is an apocalyptic number.

25405500543 is a deficient number, since it is larger than the sum of its proper divisors (8468500185).

25405500543 is an equidigital number, since it uses as much as digits as its factorization.

25405500543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8468500184.

The product of its (nonzero) digits is 60000, while the sum is 33.

The spelling of 25405500543 in words is "twenty-five billion, four hundred five million, five hundred thousand, five hundred forty-three".