6642503 has 4 divisors (see below), whose sum is σ = 7591440. Its totient is φ = 5693568.

The previous prime is 6642497. The next prime is 6642521. The reversal of 6642503 is 3052466.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6642503 - 2⁴ = 6642487 is a prime.

It is a super-2 number, since 2×6642503² = 88245692210018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6642523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 474458 + ... + 474471.

It is an arithmetic number, because the mean of its divisors is an integer number (1897860).

Almost surely, 2^6642503 is an apocalyptic number.

6642503 is a deficient number, since it is larger than the sum of its proper divisors (948937).

6642503 is an equidigital number, since it uses as much as digits as its factorization.

6642503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 948936.

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 6642503 is about 2577.3053757752. The cubic root of 6642503 is about 187.9795416851.

Adding to 6642503 its reverse (3052466), we get a palindrome (9694969).

The spelling of 6642503 in words is "six million, six hundred forty-two thousand, five hundred three".