25543744453 has 2 divisors, whose sum is σ = 25543744454. Its totient is φ = 25543744452.

The previous prime is 25543744441. The next prime is 25543744469. The reversal of 25543744453 is 35444734552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21455804484 + 4087939969 = 146478^2 + 63937^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25543744453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25543744403) 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 as a sum of consecutive naturals, namely, 12771872226 + 12771872227.

It is an arithmetic number, because the mean of its divisors is an integer number (12771872227).

Almost surely, 2^25543744453 is an apocalyptic number.

It is an amenable number.

25543744453 is a deficient number, since it is larger than the sum of its proper divisors (1).

25543744453 is an equidigital number, since it uses as much as digits as its factorization.

25543744453 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032000, while the sum is 46.

Subtracting 25543744453 from its reverse (35444734552), we obtain a palindrome (9900990099).

The spelling of 25543744453 in words is "twenty-five billion, five hundred forty-three million, seven hundred forty-four thousand, four hundred fifty-three".