213493666 has 8 divisors (see below), whose sum is σ = 320498640. Its totient is φ = 106660788.

The previous prime is 213493627. The next prime is 213493673. The reversal of 213493666 is 666394312.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39876 + ... + 44911.

It is an arithmetic number, because the mean of its divisors is an integer number (40062330).

Almost surely, 2^213493666 is an apocalyptic number.

213493666 is a deficient number, since it is larger than the sum of its proper divisors (107004974).

213493666 is a wasteful number, since it uses less digits than its factorization.

213493666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86048.

The product of its digits is 139968, while the sum is 40.

The square root of 213493666 is about 14611.4224495769. The cubic root of 213493666 is about 597.6702861339.

The spelling of 213493666 in words is "two hundred thirteen million, four hundred ninety-three thousand, six hundred sixty-six".