6643351 has 8 divisors (see below), whose sum is σ = 7804944. Its totient is φ = 5574720.

The previous prime is 6643337. The next prime is 6643361. The reversal of 6643351 is 1533466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6643351 - 2⁵ = 6643319 is a prime.

It is a super-2 number, since 2×6643351² = 88268225018402, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

6643351 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6643321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23086 + ... + 23371.

It is an arithmetic number, because the mean of its divisors is an integer number (975618).

Almost surely, 2^6643351 is an apocalyptic number.

6643351 is a deficient number, since it is larger than the sum of its proper divisors (1161593).

6643351 is a wasteful number, since it uses less digits than its factorization.

6643351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46481.

The product of its digits is 6480, while the sum is 28.

The square root of 6643351 is about 2577.4698834322. The cubic root of 6643351 is about 187.9875406712.

The spelling of 6643351 in words is "six million, six hundred forty-three thousand, three hundred fifty-one".