6564765566 has 8 divisors (see below), whose sum is σ = 9853096080. Its totient is φ = 3280400208.

The previous prime is 6564765541. The next prime is 6564765587. The reversal of 6564765566 is 6655674656.

It is a happy number.

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

It is a super-2 number, since 2×6564765566² = 86192293873078600712, which contains 22 as substring.

It is a congruent number.

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, 987146 + ... + 993773.

It is an arithmetic number, because the mean of its divisors is an integer number (1231637010).

Almost surely, 2^6564765566 is an apocalyptic number.

6564765566 is a deficient number, since it is larger than the sum of its proper divisors (3288330514).

6564765566 is a wasteful number, since it uses less digits than its factorization.

6564765566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1982578.

The product of its digits is 27216000, while the sum is 56.

The square root of 6564765566 is about 81023.2409003738. The cubic root of 6564765566 is about 1872.4335200756.

The spelling of 6564765566 in words is "six billion, five hundred sixty-four million, seven hundred sixty-five thousand, five hundred sixty-six".