643541432111 has 2 divisors, whose sum is σ = 643541432112. Its totient is φ = 643541432110.

The previous prime is 643541432101. The next prime is 643541432113. The reversal of 643541432111 is 111234145346.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 643541432111 - 2³⁴ = 626361562927 is a prime.

Together with 643541432113, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (643541432113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321770716055 + 321770716056.

It is an arithmetic number, because the mean of its divisors is an integer number (321770716056).

Almost surely, 2^643541432111 is an apocalyptic number.

643541432111 is a deficient number, since it is larger than the sum of its proper divisors (1).

643541432111 is an equidigital number, since it uses as much as digits as its factorization.

643541432111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34560, while the sum is 35.

Adding to 643541432111 its reverse (111234145346), we get a palindrome (754775577457).

The spelling of 643541432111 in words is "six hundred forty-three billion, five hundred forty-one million, four hundred thirty-two thousand, one hundred eleven".