6643137 has 4 divisors (see below), whose sum is σ = 8857520. Its totient is φ = 4428756.

The previous prime is 6643129. The next prime is 6643139. The reversal of 6643137 is 7313466.

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 not a de Polignac number, because 6643137 - 2³ = 6643129 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6643139) 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, 1107187 + ... + 1107192.

It is an arithmetic number, because the mean of its divisors is an integer number (2214380).

Almost surely, 2^6643137 is an apocalyptic number.

It is an amenable number.

6643137 is a deficient number, since it is larger than the sum of its proper divisors (2214383).

6643137 is a wasteful number, since it uses less digits than its factorization.

6643137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2214382.

The product of its digits is 9072, while the sum is 30.

The square root of 6643137 is about 2577.4283695187. The cubic root of 6643137 is about 187.9855221234.

The spelling of 6643137 in words is "six million, six hundred forty-three thousand, one hundred thirty-seven".