6643053 has 10 divisors (see below), whose sum is σ = 9923694. Its totient is φ = 4428648.

The previous prime is 6643051. The next prime is 6643057. The reversal of 6643053 is 3503466.

It can be written as a sum of positive squares in only one way, i.e., 3337929 + 3305124 = 1827^2 + 1818^2 .

It is not a de Polignac number, because 6643053 - 2¹ = 6643051 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a d-powerful number, because it can be written as 6 + 6⁷ + 4¹⁰ + 3¹² + 0 + 5³ + 3¹⁴ .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6643051) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 40926 + ... + 41087.

Almost surely, 2^6643053 is an apocalyptic number.

It is an amenable number.

6643053 is a deficient number, since it is larger than the sum of its proper divisors (3280641).

6643053 is an equidigital number, since it uses as much as digits as its factorization.

6643053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82025 (or 82016 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 27.

The square root of 6643053 is about 2577.4120741550. The cubic root of 6643053 is about 187.9847297843.

The spelling of 6643053 in words is "six million, six hundred forty-three thousand, fifty-three".