6543189893 has 2 divisors, whose sum is σ = 6543189894. Its totient is φ = 6543189892.

The previous prime is 6543189883. The next prime is 6543189943. The reversal of 6543189893 is 3989813456.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4472666884 + 2070523009 = 66878^2 + 45503^2 .

It is a cyclic number.

It is not a de Polignac number, because 6543189893 - 2¹⁸ = 6542927749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6543189803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3271594946 + 3271594947.

It is an arithmetic number, because the mean of its divisors is an integer number (3271594947).

Almost surely, 2^6543189893 is an apocalyptic number.

It is an amenable number.

6543189893 is a deficient number, since it is larger than the sum of its proper divisors (1).

6543189893 is an equidigital number, since it uses as much as digits as its factorization.

6543189893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5598720, while the sum is 56.

The square root of 6543189893 is about 80889.9863580159. The cubic root of 6543189893 is about 1870.3799634931.

The spelling of 6543189893 in words is "six billion, five hundred forty-three million, one hundred eighty-nine thousand, eight hundred ninety-three".