6564037681 has 4 divisors (see below), whose sum is σ = 6775780864. Its totient is φ = 6352294500.

The previous prime is 6564037679. The next prime is 6564037691. The reversal of 6564037681 is 1867304656.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6564037681 - 2¹ = 6564037679 is a prime.

It is a super-2 number, since 2×6564037681² = 86173181355175715522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6564037621) 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, 105871545 + ... + 105871606.

It is an arithmetic number, because the mean of its divisors is an integer number (1693945216).

Almost surely, 2^6564037681 is an apocalyptic number.

It is an amenable number.

6564037681 is a deficient number, since it is larger than the sum of its proper divisors (211743183).

6564037681 is a wasteful number, since it uses less digits than its factorization.

6564037681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211743182.

The product of its (nonzero) digits is 725760, while the sum is 46.

The square root of 6564037681 is about 81018.7489473887. The cubic root of 6564037681 is about 1872.3643139156.

The spelling of 6564037681 in words is "six billion, five hundred sixty-four million, thirty-seven thousand, six hundred eighty-one".