6666506 has 32 divisors (see below), whose sum is σ = 12659328. Its totient is φ = 2557440.

The previous prime is 6666487. The next prime is 6666509. The reversal of 6666506 is 6056666.

It is not an unprimeable number, because it can be changed into a prime (6666509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10946 + ... + 11538.

It is an arithmetic number, because the mean of its divisors is an integer number (395604).

Almost surely, 2^6666506 is an apocalyptic number.

6666506 is a deficient number, since it is larger than the sum of its proper divisors (5992822).

6666506 is a wasteful number, since it uses less digits than its factorization.

6666506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 686.

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 6666506 is about 2581.9577843179. The cubic root of 6666506 is about 188.2056938328.

The spelling of 6666506 in words is "six million, six hundred sixty-six thousand, five hundred six".