666566242 has 8 divisors (see below), whose sum is σ = 999982800. Its totient is φ = 333238644.

The previous prime is 666566207. The next prime is 666566261. The reversal of 666566242 is 242665666.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1609 + ... + 36547.

It is an arithmetic number, because the mean of its divisors is an integer number (124997850).

Almost surely, 2^666566242 is an apocalyptic number.

666566242 is a deficient number, since it is larger than the sum of its proper divisors (333416558).

666566242 is a wasteful number, since it uses less digits than its factorization.

666566242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44480.

The product of its digits is 622080, while the sum is 43.

The square root of 666566242 is about 25817.9441861663. The cubic root of 666566242 is about 873.5365980201.

The spelling of 666566242 in words is "six hundred sixty-six million, five hundred sixty-six thousand, two hundred forty-two".