6600643 has 6 divisors (see below), whose sum is σ = 7678356. Its totient is φ = 5657652.

The previous prime is 6600623. The next prime is 6600667. The reversal of 6600643 is 3460066.

It is a happy number.

It is not a de Polignac number, because 6600643 - 2⁵ = 6600611 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6600623) 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 5 ways as a sum of consecutive naturals, for example, 67305 + ... + 67402.

It is an arithmetic number, because the mean of its divisors is an integer number (1279726).

Almost surely, 2^6600643 is an apocalyptic number.

6600643 is a deficient number, since it is larger than the sum of its proper divisors (1077713).

6600643 is a wasteful number, since it uses less digits than its factorization.

6600643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134721 (or 134714 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 6600643 is about 2569.1716563904. The cubic root of 6600643 is about 187.5838368788.

It can be divided in two parts, 66006 and 43, that added together give a square (66049 = 257²).

The spelling of 6600643 in words is "six million, six hundred thousand, six hundred forty-three".