216663371 has 8 divisors (see below), whose sum is σ = 225961344. Its totient is φ = 207509760.

The previous prime is 216663361. The next prime is 216663383. The reversal of 216663371 is 173366612.

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

It is a cyclic number.

It is not a de Polignac number, because 216663371 - 2²⁶ = 149554507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216663341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33020 + ... + 39033.

It is an arithmetic number, because the mean of its divisors is an integer number (28245168).

Almost surely, 2^216663371 is an apocalyptic number.

216663371 is a deficient number, since it is larger than the sum of its proper divisors (9297973).

216663371 is an equidigital number, since it uses as much as digits as its factorization.

216663371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72181.

The product of its digits is 27216, while the sum is 35.

The square root of 216663371 is about 14719.4894952237. The cubic root of 216663371 is about 600.6136046757.

Subtracting from 216663371 its sum of digits (35), we obtain a triangular number (216663336 = T₂₀₈₁₆).

The spelling of 216663371 in words is "two hundred sixteen million, six hundred sixty-three thousand, three hundred seventy-one".