25443500243 has 40 divisors (see below), whose sum is σ = 31635076608. Its totient is φ = 20414586192.

The previous prime is 25443500237. The next prime is 25443500273. The reversal of 25443500243 is 34200534452.

It is not a de Polignac number, because 25443500243 - 2⁸ = 25443499987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25443500273) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2590580 + ... + 2600382.

Almost surely, 2^25443500243 is an apocalyptic number.

25443500243 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

25443500243 is a deficient number, since it is larger than the sum of its proper divisors (6191576365).

25443500243 is an frugal number, since it uses more digits than its factorization.

25443500243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9901 (or 9880 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 32.

The spelling of 25443500243 in words is "twenty-five billion, four hundred forty-three million, five hundred thousand, two hundred forty-three".