8221566064 has 20 divisors (see below), whose sum is σ = 16229838456. Its totient is φ = 4033220672.

The previous prime is 8221566049. The next prime is 8221566109. The reversal of 8221566064 is 4606651228.

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, 4846774 + ... + 4848469.

Almost surely, 2^8221566064 is an apocalyptic number.

It is an amenable number.

8221566064 is a deficient number, since it is larger than the sum of its proper divisors (8008272392).

8221566064 is a wasteful number, since it uses less digits than its factorization.

8221566064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9695304 (or 9695298 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 40.

The square root of 8221566064 is about 90672.8518576536. The cubic root of 8221566064 is about 2018.2959572716.

The spelling of 8221566064 in words is "eight billion, two hundred twenty-one million, five hundred sixty-six thousand, sixty-four".