6620503 has 2 divisors, whose sum is σ = 6620504. Its totient is φ = 6620502.

The previous prime is 6620501. The next prime is 6620507. The reversal of 6620503 is 3050266.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6620503 - 2¹ = 6620501 is a prime.

Together with 6620501, it forms a pair of twin primes.

6620503 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6620501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3310251 + 3310252.

It is an arithmetic number, because the mean of its divisors is an integer number (3310252).

Almost surely, 2^6620503 is an apocalyptic number.

6620503 is a deficient number, since it is larger than the sum of its proper divisors (1).

6620503 is an equidigital number, since it uses as much as digits as its factorization.

6620503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 6620503 is about 2573.0338124479. The cubic root of 6620503 is about 187.7717824518.

Adding to 6620503 its reverse (3050266), we get a palindrome (9670769).

The spelling of 6620503 in words is "six million, six hundred twenty thousand, five hundred three".