6642111 has 8 divisors (see below), whose sum is σ = 10121344. Its totient is φ = 3795480.

The previous prime is 6642109. The next prime is 6642127. The reversal of 6642111 is 1112466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6642111 - 2¹ = 6642109 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 316291 = 6642111 / (6 + 6 + 4 + 2 + 1 + 1 + 1).

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6642151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 158125 + ... + 158166.

It is an arithmetic number, because the mean of its divisors is an integer number (1265168).

Almost surely, 2^6642111 is an apocalyptic number.

6642111 is a deficient number, since it is larger than the sum of its proper divisors (3479233).

6642111 is a wasteful number, since it uses less digits than its factorization.

6642111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316301.

The product of its digits is 288, while the sum is 21.

The square root of 6642111 is about 2577.2293262339. The cubic root of 6642111 is about 187.9758438104.

Adding to 6642111 its reverse (1112466), we get a palindrome (7754577).

It can be divided in two parts, 664 and 2111, that added together give a triangular number (2775 = T₇₄).

The spelling of 6642111 in words is "six million, six hundred forty-two thousand, one hundred eleven".