6656699 has 6 divisors (see below), whose sum is σ = 7743564. Its totient is φ = 5705700.

The previous prime is 6656659. The next prime is 6656711. The reversal of 6656699 is 9966566.

It is a happy number.

It is not a de Polignac number, because 6656699 - 2¹⁶ = 6591163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6656659) 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, 67877 + ... + 67974.

It is an arithmetic number, because the mean of its divisors is an integer number (1290594).

Almost surely, 2^6656699 is an apocalyptic number.

6656699 is a deficient number, since it is larger than the sum of its proper divisors (1086865).

6656699 is a wasteful number, since it uses less digits than its factorization.

6656699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135865 (or 135858 counting only the distinct ones).

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

The square root of 6656699 is about 2580.0579450857. The cubic root of 6656699 is about 188.1133596547.

It can be divided in two parts, 66 and 56699, that added together give a palindrome (56765).

The spelling of 6656699 in words is "six million, six hundred fifty-six thousand, six hundred ninety-nine".