6543994996 has 48 divisors (see below), whose sum is σ = 14416496640. Its totient is φ = 2524842720.

The previous prime is 6543994981. The next prime is 6543994999. The reversal of 6543994996 is 6994993456.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6543994999) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71416 + ... + 134863.

It is an arithmetic number, because the mean of its divisors is an integer number (300343680).

Almost surely, 2^6543994996 is an apocalyptic number.

It is an amenable number.

6543994996 is an abundant number, since it is smaller than the sum of its proper divisors (7872501644).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6543994996 is a wasteful number, since it uses less digits than its factorization.

6543994996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206404 (or 206402 counting only the distinct ones).

The product of its digits is 56687040, while the sum is 64.

The square root of 6543994996 is about 80894.9627356364. The cubic root of 6543994996 is about 1870.4566736190.

The spelling of 6543994996 in words is "six billion, five hundred forty-three million, nine hundred ninety-four thousand, nine hundred ninety-six".