6642106 has 4 divisors (see below), whose sum is σ = 9963162. Its totient is φ = 3321052.

The previous prime is 6642089. The next prime is 6642109. The reversal of 6642106 is 6012466.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6012466 = 2 ⋅3006233.

It can be written as a sum of positive squares in only one way, i.e., 3455881 + 3186225 = 1859^2 + 1785^2 .

It is not an unprimeable number, because it can be changed into a prime (6642109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1660525 + ... + 1660528.

Almost surely, 2^6642106 is an apocalyptic number.

6642106 is a deficient number, since it is larger than the sum of its proper divisors (3321056).

6642106 is a wasteful number, since it uses less digits than its factorization.

6642106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3321055.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 6642106 is about 2577.2283561997. The cubic root of 6642106 is about 187.9757966427.

The spelling of 6642106 in words is "six million, six hundred forty-two thousand, one hundred six".