6564397698 has 48 divisors (see below), whose sum is σ = 14617422456. Its totient is φ = 2127513600.

The previous prime is 6564397687. The next prime is 6564397699. The reversal of 6564397698 is 8967934656.

6564397698 is a `hidden beast` number, since 6 + 564 + 3 + 9 + 7 + 69 + 8 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 6473328849 + 91068849 = 80457^2 + 9543^2 .

It is not an unprimeable number, because it can be changed into a prime (6564397699) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1364898 + ... + 1369698.

Almost surely, 2^6564397698 is an apocalyptic number.

6564397698 is an abundant number, since it is smaller than the sum of its proper divisors (8053024758).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6564397698 is a wasteful number, since it uses less digits than its factorization.

6564397698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6899 (or 6896 counting only the distinct ones).

The product of its digits is 58786560, while the sum is 63.

The square root of 6564397698 is about 81020.9707298055. The cubic root of 6564397698 is about 1872.3985444046.

The spelling of 6564397698 in words is "six billion, five hundred sixty-four million, three hundred ninety-seven thousand, six hundred ninety-eight".