6666564 has 24 divisors (see below), whose sum is σ = 15609888. Its totient is φ = 2214400.

The previous prime is 6666563. The next prime is 6666577. The reversal of 6666564 is 4656666.

It is not an unprimeable number, because it can be changed into a prime (6666563) 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 7 ways as a sum of consecutive naturals, for example, 3364 + ... + 4964.

It is an arithmetic number, because the mean of its divisors is an integer number (650412).

Almost surely, 2^6666564 is an apocalyptic number.

It is an amenable number.

6666564 is an abundant number, since it is smaller than the sum of its proper divisors (8943324).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6666564 is a wasteful number, since it uses less digits than its factorization.

6666564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1955 (or 1953 counting only the distinct ones).

The product of its digits is 155520, while the sum is 39.

The square root of 6666564 is about 2581.9690160806. The cubic root of 6666564 is about 188.2062396409.

The spelling of 6666564 in words is "six million, six hundred sixty-six thousand, five hundred sixty-four".