666394562 has 16 divisors (see below), whose sum is σ = 1052721600. Its totient is φ = 315504720.

The previous prime is 666394483. The next prime is 666394579. The reversal of 666394562 is 265493666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 119987 + ... + 125417.

It is an arithmetic number, because the mean of its divisors is an integer number (65795100).

Almost surely, 2^666394562 is an apocalyptic number.

666394562 is a deficient number, since it is larger than the sum of its proper divisors (386327038).

666394562 is a wasteful number, since it uses less digits than its factorization.

666394562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8681.

The product of its digits is 1399680, while the sum is 47.

The square root of 666394562 is about 25814.6191527204. The cubic root of 666394562 is about 873.4615959019.

The spelling of 666394562 in words is "six hundred sixty-six million, three hundred ninety-four thousand, five hundred sixty-two".