6543648243 has 12 divisors (see below), whose sum is σ = 10311203448. Its totient is φ = 3965847360.

The previous prime is 6543648239. The next prime is 6543648259. The reversal of 6543648243 is 3428463456.

6543648243 is a `hidden beast` number, since 6 + 543 + 64 + 8 + 2 + 43 = 666.

It is not a de Polignac number, because 6543648243 - 2² = 6543648239 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6543648263) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33048630 + ... + 33048827.

It is an arithmetic number, because the mean of its divisors is an integer number (859266954).

Almost surely, 2^6543648243 is an apocalyptic number.

6543648243 is a deficient number, since it is larger than the sum of its proper divisors (3767555205).

6543648243 is a wasteful number, since it uses less digits than its factorization.

6543648243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66097474 (or 66097471 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 45.

The square root of 6543648243 is about 80892.8194773801. The cubic root of 6543648243 is about 1870.4236358024.

The spelling of 6543648243 in words is "six billion, five hundred forty-three million, six hundred forty-eight thousand, two hundred forty-three".