6599666 has 16 divisors (see below), whose sum is σ = 10528704. Its totient is φ = 3095664.

The previous prime is 6599639. The next prime is 6599687. The reversal of 6599666 is 6669956.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 6599666.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1085 + ... + 3791.

It is an arithmetic number, because the mean of its divisors is an integer number (658044).

Almost surely, 2^6599666 is an apocalyptic number.

6599666 is a deficient number, since it is larger than the sum of its proper divisors (3929038).

6599666 is a wasteful number, since it uses less digits than its factorization.

6599666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2785.

The product of its digits is 524880, while the sum is 47.

The square root of 6599666 is about 2568.9815102488. The cubic root of 6599666 is about 187.5745812931.

It can be divided in two parts, 6599 and 666, that multiplied together give a palindrome (4394934).

The spelling of 6599666 in words is "six million, five hundred ninety-nine thousand, six hundred sixty-six".