6545666 has 8 divisors (see below), whose sum is σ = 9979644. Its totient is φ = 3219120.

The previous prime is 6545653. The next prime is 6545687. The reversal of 6545666 is 6665456.

It can be written as a sum of positive squares in 2 ways, for example, as 4644025 + 1901641 = 2155^2 + 1379^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26705 + ... + 26948.

Almost surely, 2^6545666 is an apocalyptic number.

6545666 is a deficient number, since it is larger than the sum of its proper divisors (3433978).

6545666 is a wasteful number, since it uses less digits than its factorization.

6545666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53716.

The product of its digits is 129600, while the sum is 38.

The square root of 6545666 is about 2558.4499213391. The cubic root of 6545666 is about 187.0615866619.

The spelling of 6545666 in words is "six million, five hundred forty-five thousand, six hundred sixty-six".