6543244645 has 16 divisors (see below), whose sum is σ = 9156729600. Its totient is φ = 4486795152.

The previous prime is 6543244621. The next prime is 6543244651. The reversal of 6543244645 is 5464423456.

It is a de Polignac number, because none of the positive numbers 2^k-6543244645 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1905937 + ... + 1909366.

It is an arithmetic number, because the mean of its divisors is an integer number (572295600).

Almost surely, 2^6543244645 is an apocalyptic number.

It is an amenable number.

6543244645 is a deficient number, since it is larger than the sum of its proper divisors (2613484955).

6543244645 is an equidigital number, since it uses as much as digits as its factorization.

6543244645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3815329 (or 3815315 counting only the distinct ones).

The product of its digits is 1382400, while the sum is 43.

The square root of 6543244645 is about 80890.3247922766. The cubic root of 6543244645 is about 1870.3851804571.

The spelling of 6543244645 in words is "six billion, five hundred forty-three million, two hundred forty-four thousand, six hundred forty-five".