6620543 has 4 divisors (see below), whose sum is σ = 6626928. Its totient is φ = 6614160.

The previous prime is 6620519. The next prime is 6620587. The reversal of 6620543 is 3450266.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3450266 = 2 ⋅1725133.

It is a cyclic number.

It is not a de Polignac number, because 6620543 - 2⁸ = 6620287 is a prime.

It is a super-2 number, since 2×6620543² = 87663179229698, 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 (6620503) 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, 1238 + ... + 3843.

It is an arithmetic number, because the mean of its divisors is an integer number (1656732).

Almost surely, 2^6620543 is an apocalyptic number.

6620543 is a deficient number, since it is larger than the sum of its proper divisors (6385).

6620543 is a wasteful number, since it uses less digits than its factorization.

6620543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6384.

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

The square root of 6620543 is about 2573.0415853616. The cubic root of 6620543 is about 187.7721606132.

The spelling of 6620543 in words is "six million, six hundred twenty thousand, five hundred forty-three".