6543994256 has 40 divisors (see below), whose sum is σ = 13035483384. Its totient is φ = 3180579840.

The previous prime is 6543994211. The next prime is 6543994267. The reversal of 6543994256 is 6524993456.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 63744256 + 6480250000 = 7984^2 + 80500^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6543994198 and 6543994207.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 163706 + ... + 199718.

Almost surely, 2^6543994256 is an apocalyptic number.

It is an amenable number.

6543994256 is a deficient number, since it is larger than the sum of its proper divisors (6491489128).

6543994256 is a wasteful number, since it uses less digits than its factorization.

6543994256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36339 (or 36333 counting only the distinct ones).

The product of its digits is 6998400, while the sum is 53.

The square root of 6543994256 is about 80894.9581618039. The cubic root of 6543994256 is about 1870.4566031148.

The spelling of 6543994256 in words is "six billion, five hundred forty-three million, nine hundred ninety-four thousand, two hundred fifty-six".