6616564 has 12 divisors (see below), whose sum is σ = 11699044. Its totient is φ = 3273984.

The previous prime is 6616549. The next prime is 6616567. The reversal of 6616564 is 4656166.

It can be written as a sum of positive squares in 2 ways, for example, as 2696164 + 3920400 = 1642^2 + 1980^2 .

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6616567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8139 + ... + 8914.

Almost surely, 2^6616564 is an apocalyptic number.

It is an amenable number.

6616564 is a deficient number, since it is larger than the sum of its proper divisors (5082480).

6616564 is a wasteful number, since it uses less digits than its factorization.

6616564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17154 (or 17152 counting only the distinct ones).

The product of its digits is 25920, while the sum is 34.

The square root of 6616564 is about 2572.2682597272. The cubic root of 6616564 is about 187.7345355445.

It can be divided in two parts, 661 and 6564, that added together give a square (7225 = 85²).

The spelling of 6616564 in words is "six million, six hundred sixteen thousand, five hundred sixty-four".