6666542 has 8 divisors (see below), whose sum is σ = 10042032. Its totient is φ = 3319200.

The previous prime is 6666523. The next prime is 6666547. The reversal of 6666542 is 2456666.

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

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 (6666547) 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 in 3 ways as a sum of consecutive naturals, for example, 6434 + ... + 7397.

It is an arithmetic number, because the mean of its divisors is an integer number (1255254).

Almost surely, 2^6666542 is an apocalyptic number.

6666542 is a deficient number, since it is larger than the sum of its proper divisors (3375490).

6666542 is a wasteful number, since it uses less digits than its factorization.

6666542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14074.

The product of its digits is 51840, while the sum is 35.

The square root of 6666542 is about 2581.9647557626. The cubic root of 6666542 is about 188.2060326106.

The spelling of 6666542 in words is "six million, six hundred sixty-six thousand, five hundred forty-two".