216522633 has 4 divisors (see below), whose sum is σ = 288696848. Its totient is φ = 144348420.

The previous prime is 216522623. The next prime is 216522637. The reversal of 216522633 is 336225612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 216522633 - 2⁹ = 216522121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 216522633.

It is not an unprimeable number, because it can be changed into a prime (216522637) 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, 36087103 + ... + 36087108.

It is an arithmetic number, because the mean of its divisors is an integer number (72174212).

Almost surely, 2^216522633 is an apocalyptic number.

It is an amenable number.

216522633 is a deficient number, since it is larger than the sum of its proper divisors (72174215).

216522633 is an equidigital number, since it uses as much as digits as its factorization.

216522633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72174214.

The product of its digits is 12960, while the sum is 30.

The square root of 216522633 is about 14714.7080501110. The cubic root of 216522633 is about 600.4835296715.

The spelling of 216522633 in words is "two hundred sixteen million, five hundred twenty-two thousand, six hundred thirty-three".