6416565643 has 4 divisors (see below), whose sum is σ = 6444832680. Its totient is φ = 6388298608.

The previous prime is 6416565637. The next prime is 6416565647. The reversal of 6416565643 is 3465656146.

It is a happy number.

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 6416565643 - 2⁹ = 6416565131 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6416565593 and 6416565602.

It is not an unprimeable number, because it can be changed into a prime (6416565647) 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, 14133178 + ... + 14133631.

It is an arithmetic number, because the mean of its divisors is an integer number (1611208170).

Almost surely, 2^6416565643 is an apocalyptic number.

6416565643 is a deficient number, since it is larger than the sum of its proper divisors (28267037).

6416565643 is a wasteful number, since it uses less digits than its factorization.

6416565643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28267036.

The product of its digits is 1555200, while the sum is 46.

The square root of 6416565643 is about 80103.4683581179. The cubic root of 6416565643 is about 1858.2360471493.

The spelling of 6416565643 in words is "six billion, four hundred sixteen million, five hundred sixty-five thousand, six hundred forty-three".