6543016643 has 16 divisors (see below), whose sum is σ = 7180016640. Its totient is φ = 5939244000.

The previous prime is 6543016639. The next prime is 6543016679. The reversal of 6543016643 is 3466103456.

It is a cyclic number.

It is not a de Polignac number, because 6543016643 - 2² = 6543016639 is a prime.

It is a super-2 number, since 2×6543016643² = 85622133581149978898, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6543016597 and 6543016606.

It is not an unprimeable number, because it can be changed into a prime (6543012643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4496 + ... + 114482.

It is an arithmetic number, because the mean of its divisors is an integer number (448751040).

Almost surely, 2^6543016643 is an apocalyptic number.

6543016643 is a deficient number, since it is larger than the sum of its proper divisors (636999997).

6543016643 is a wasteful number, since it uses less digits than its factorization.

6543016643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110138.

The product of its (nonzero) digits is 155520, while the sum is 38.

The square root of 6543016643 is about 80888.9154519950. The cubic root of 6543016643 is about 1870.3634554293.

The spelling of 6543016643 in words is "six billion, five hundred forty-three million, sixteen thousand, six hundred forty-three".