6643516 has 12 divisors (see below), whose sum is σ = 12683160. Its totient is φ = 3019760.

The previous prime is 6643513. The next prime is 6643537. The reversal of 6643516 is 6153466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6643513) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75451 + ... + 75538.

It is an arithmetic number, because the mean of its divisors is an integer number (1056930).

Almost surely, 2^6643516 is an apocalyptic number.

It is an amenable number.

6643516 is a deficient number, since it is larger than the sum of its proper divisors (6039644).

6643516 is a wasteful number, since it uses less digits than its factorization.

6643516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151004 (or 151002 counting only the distinct ones).

The product of its digits is 12960, while the sum is 31.

The square root of 6643516 is about 2577.5018913669. The cubic root of 6643516 is about 187.9890969986.

The spelling of 6643516 in words is "six million, six hundred forty-three thousand, five hundred sixteen".