6668542 has 4 divisors (see below), whose sum is σ = 10002816. Its totient is φ = 3334270.

The previous prime is 6668537. The next prime is 6668549. The reversal of 6668542 is 2458666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6668549) 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, 1667134 + ... + 1667137.

It is an arithmetic number, because the mean of its divisors is an integer number (2500704).

Almost surely, 2^6668542 is an apocalyptic number.

6668542 is a deficient number, since it is larger than the sum of its proper divisors (3334274).

6668542 is a wasteful number, since it uses less digits than its factorization.

6668542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3334273.

The product of its digits is 69120, while the sum is 37.

The square root of 6668542 is about 2582.3520286746. The cubic root of 6668542 is about 188.2248516840.

The spelling of 6668542 in words is "six million, six hundred sixty-eight thousand, five hundred forty-two".