6543195481 has 2 divisors, whose sum is σ = 6543195482. Its totient is φ = 6543195480.

The previous prime is 6543195479. The next prime is 6543195559. The reversal of 6543195481 is 1845913456.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6538177881 + 5017600 = 80859^2 + 2240^2 .

It is a cyclic number.

It is not a de Polignac number, because 6543195481 - 2¹ = 6543195479 is a prime.

It is a super-2 number, since 2×6543195481² = 85626814205157642722, which contains 22 as substring.

Together with 6543195479, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (6543190481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3271597740 + 3271597741.

It is an arithmetic number, because the mean of its divisors is an integer number (3271597741).

Almost surely, 2^6543195481 is an apocalyptic number.

It is an amenable number.

6543195481 is a deficient number, since it is larger than the sum of its proper divisors (1).

6543195481 is an equidigital number, since it uses as much as digits as its factorization.

6543195481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 518400, while the sum is 46.

The square root of 6543195481 is about 80890.0208987487. The cubic root of 6543195481 is about 1870.3804959388.

The spelling of 6543195481 in words is "six billion, five hundred forty-three million, one hundred ninety-five thousand, four hundred eighty-one".