6564705247 has 4 divisors (see below), whose sum is σ = 6585813936. Its totient is φ = 6543596560.

The previous prime is 6564705221. The next prime is 6564705271. The reversal of 6564705247 is 7425074656.

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

It is a cyclic number.

It is not a de Polignac number, because 6564705247 - 2¹¹ = 6564703199 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6564705197 and 6564705206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6564705647) 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, 10553878 + ... + 10554499.

It is an arithmetic number, because the mean of its divisors is an integer number (1646453484).

Almost surely, 2^6564705247 is an apocalyptic number.

6564705247 is a deficient number, since it is larger than the sum of its proper divisors (21108689).

6564705247 is a wasteful number, since it uses less digits than its factorization.

6564705247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21108688.

The product of its (nonzero) digits is 1411200, while the sum is 46.

The square root of 6564705247 is about 81022.8686668153. The cubic root of 6564705247 is about 1872.4277852344.

The spelling of 6564705247 in words is "six billion, five hundred sixty-four million, seven hundred five thousand, two hundred forty-seven".