6664659 has 8 divisors (see below), whose sum is σ = 9172992. Its totient is φ = 4299720.

The previous prime is 6664657. The next prime is 6664661. The reversal of 6664659 is 9564666.

It is an interprime number because it is at equal distance from previous prime (6664657) and next prime (6664661).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6664659 - 2¹ = 6664657 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6664659.

It is not an unprimeable number, because it can be changed into a prime (6664657) 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 7 ways as a sum of consecutive naturals, for example, 35739 + ... + 35924.

It is an arithmetic number, because the mean of its divisors is an integer number (1146624).

Almost surely, 2^6664659 is an apocalyptic number.

6664659 is a deficient number, since it is larger than the sum of its proper divisors (2508333).

6664659 is a wasteful number, since it uses less digits than its factorization.

6664659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71697.

The product of its digits is 233280, while the sum is 42.

The square root of 6664659 is about 2581.6000852185. The cubic root of 6664659 is about 188.1883110127.

The spelling of 6664659 in words is "six million, six hundred sixty-four thousand, six hundred fifty-nine".