6565637897 has 16 divisors (see below), whose sum is σ = 8084399232. Its totient is φ = 5192467200.

The previous prime is 6565637887. The next prime is 6565637971. The reversal of 6565637897 is 7987365656.

It is a cyclic number.

It is not a de Polignac number, because 6565637897 - 2¹⁸ = 6565375753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6565637887) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 205022 + ... + 234872.

It is an arithmetic number, because the mean of its divisors is an integer number (505274952).

Almost surely, 2^6565637897 is an apocalyptic number.

It is an amenable number.

6565637897 is a deficient number, since it is larger than the sum of its proper divisors (1518761335).

6565637897 is a wasteful number, since it uses less digits than its factorization.

6565637897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32288.

The product of its digits is 57153600, while the sum is 62.

The square root of 6565637897 is about 81028.6239362363. The cubic root of 6565637897 is about 1872.5164531951.

The spelling of 6565637897 in words is "six billion, five hundred sixty-five million, six hundred thirty-seven thousand, eight hundred ninety-seven".