216416623 has 4 divisors (see below), whose sum is σ = 221021280. Its totient is φ = 211811968.

The previous prime is 216416621. The next prime is 216416671. The reversal of 216416623 is 326614612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 216416623 - 2¹ = 216416621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216416621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2302258 + ... + 2302351.

It is an arithmetic number, because the mean of its divisors is an integer number (55255320).

Almost surely, 2^216416623 is an apocalyptic number.

216416623 is a deficient number, since it is larger than the sum of its proper divisors (4604657).

216416623 is an equidigital number, since it uses as much as digits as its factorization.

216416623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4604656.

The product of its digits is 10368, while the sum is 31.

The square root of 216416623 is about 14711.1054309321. The cubic root of 216416623 is about 600.3855142819.

The spelling of 216416623 in words is "two hundred sixteen million, four hundred sixteen thousand, six hundred twenty-three".