25643445143 has 2 divisors, whose sum is σ = 25643445144. Its totient is φ = 25643445142.

The previous prime is 25643445137. The next prime is 25643445187. The reversal of 25643445143 is 34154434652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25643445143 - 2²⁰ = 25642396567 is a prime.

It is a super-3 number, since 3×25643445143³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25643445143.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25643445043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12821722571 + 12821722572.

It is an arithmetic number, because the mean of its divisors is an integer number (12821722572).

Almost surely, 2^25643445143 is an apocalyptic number.

25643445143 is a deficient number, since it is larger than the sum of its proper divisors (1).

25643445143 is an equidigital number, since it uses as much as digits as its factorization.

25643445143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 691200, while the sum is 41.

Adding to 25643445143 its reverse (34154434652), we get a palindrome (59797879795).

The spelling of 25643445143 in words is "twenty-five billion, six hundred forty-three million, four hundred forty-five thousand, one hundred forty-three".