216618970 has 16 divisors (see below), whose sum is σ = 393493320. Its totient is φ = 85852224.

The previous prime is 216618967. The next prime is 216618989. The reversal of 216618970 is 79816612.

It can be written as a sum of positive squares in 4 ways, for example, as 211324369 + 5294601 = 14537^2 + 2301^2 .

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, 98277 + ... + 100456.

Almost surely, 2^216618970 is an apocalyptic number.

216618970 is a deficient number, since it is larger than the sum of its proper divisors (176874350).

216618970 is a wasteful number, since it uses less digits than its factorization.

216618970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198849.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 216618970 is about 14717.9811794961. The cubic root of 216618970 is about 600.5725737953.

The spelling of 216618970 in words is "two hundred sixteen million, six hundred eighteen thousand, nine hundred seventy".