6643437 has 4 divisors (see below), whose sum is σ = 8857920. Its totient is φ = 4428956.

The previous prime is 6643423. The next prime is 6643453. The reversal of 6643437 is 7343466.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6643437 - 2⁸ = 6643181 is a prime.

It is a d-powerful number, because it can be written as 6³ + 6⁸ + 4³ + 3¹¹ + 4⁵ + 3¹⁴ + 7⁴ .

It is a D-number.

It is a junction number, because it is equal to n+sod(n) for n = 6643398 and 6643407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6643487) 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, 1107237 + ... + 1107242.

It is an arithmetic number, because the mean of its divisors is an integer number (2214480).

Almost surely, 2^6643437 is an apocalyptic number.

It is an amenable number.

6643437 is a deficient number, since it is larger than the sum of its proper divisors (2214483).

6643437 is a wasteful number, since it uses less digits than its factorization.

6643437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2214482.

The product of its digits is 36288, while the sum is 33.

The square root of 6643437 is about 2577.4865664053. The cubic root of 6643437 is about 187.9883518511.

The spelling of 6643437 in words is "six million, six hundred forty-three thousand, four hundred thirty-seven".