6500666 has 4 divisors (see below), whose sum is σ = 9751002. Its totient is φ = 3250332.

The previous prime is 6500633. The next prime is 6500677. The reversal of 6500666 is 6660056.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 5900041 + 600625 = 2429^2 + 775^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 1625165 + ... + 1625168.

Almost surely, 2^6500666 is an apocalyptic number.

6500666 is a deficient number, since it is larger than the sum of its proper divisors (3250336).

6500666 is a wasteful number, since it uses less digits than its factorization.

6500666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3250335.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 6500666 is about 2549.6403667969. The cubic root of 6500666 is about 186.6319316038.

The spelling of 6500666 in words is "six million, five hundred thousand, six hundred sixty-six".