216446506 has 4 divisors (see below), whose sum is σ = 324669762. Its totient is φ = 108223252.

The previous prime is 216446471. The next prime is 216446509. The reversal of 216446506 is 605644612.

216446506 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 128255625 + 88190881 = 11325^2 + 9391^2 .

It is not an unprimeable number, because it can be changed into a prime (216446509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54111625 + ... + 54111628.

Almost surely, 2^216446506 is an apocalyptic number.

216446506 is a deficient number, since it is larger than the sum of its proper divisors (108223256).

216446506 is a wasteful number, since it uses less digits than its factorization.

216446506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108223255.

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 216446506 is about 14712.1210571420. The cubic root of 216446506 is about 600.4131469322.

The spelling of 216446506 in words is "two hundred sixteen million, four hundred forty-six thousand, five hundred six".