6642518 has 4 divisors (see below), whose sum is σ = 9963780. Its totient is φ = 3321258.

The previous prime is 6642497. The next prime is 6642521. The reversal of 6642518 is 8152466.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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, 1660628 + ... + 1660631.

It is an arithmetic number, because the mean of its divisors is an integer number (2490945).

Almost surely, 2^6642518 is an apocalyptic number.

6642518 is a deficient number, since it is larger than the sum of its proper divisors (3321262).

6642518 is a wasteful number, since it uses less digits than its factorization.

6642518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3321261.

The product of its digits is 11520, while the sum is 32.

The square root of 6642518 is about 2577.3082857897. The cubic root of 6642518 is about 187.9796831825.

The spelling of 6642518 in words is "six million, six hundred forty-two thousand, five hundred eighteen".