6642664411 has 4 divisors (see below), whose sum is σ = 6653028024. Its totient is φ = 6632300800.

The previous prime is 6642664393. The next prime is 6642664417. The reversal of 6642664411 is 1144662466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1144662466 = 2 ⋅572331233.

It is a cyclic number.

It is not a de Polignac number, because 6642664411 - 2⁹ = 6642663899 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6642664417) 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, 5180845 + ... + 5182126.

It is an arithmetic number, because the mean of its divisors is an integer number (1663257006).

Almost surely, 2^6642664411 is an apocalyptic number.

6642664411 is a deficient number, since it is larger than the sum of its proper divisors (10363613).

6642664411 is a wasteful number, since it uses less digits than its factorization.

6642664411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10363612.

The product of its digits is 165888, while the sum is 40.

The square root of 6642664411 is about 81502.5423591191. The cubic root of 6642664411 is about 1879.8106428982.

The spelling of 6642664411 in words is "six billion, six hundred forty-two million, six hundred sixty-four thousand, four hundred eleven".