216764666 has 8 divisors (see below), whose sum is σ = 328186080. Its totient is φ = 107369308.

The previous prime is 216764651. The next prime is 216764701. The reversal of 216764666 is 666467612.

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, 506246 + ... + 506673.

It is an arithmetic number, because the mean of its divisors is an integer number (41023260).

Almost surely, 2^216764666 is an apocalyptic number.

216764666 is a deficient number, since it is larger than the sum of its proper divisors (111421414).

216764666 is a wasteful number, since it uses less digits than its factorization.

216764666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1013028.

The product of its digits is 435456, while the sum is 44.

The square root of 216764666 is about 14722.9299393837. The cubic root of 216764666 is about 600.7071902166.

The spelling of 216764666 in words is "two hundred sixteen million, seven hundred sixty-four thousand, six hundred sixty-six".