216551334633 has 4 divisors (see below), whose sum is σ = 288735112848. Its totient is φ = 144367556420.

The previous prime is 216551334581. The next prime is 216551334677. The reversal of 216551334633 is 336433155612.

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 a cyclic number.

It is not a de Polignac number, because 216551334633 - 2⁹ = 216551334121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216551334133) 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, 36091889103 + ... + 36091889108.

It is an arithmetic number, because the mean of its divisors is an integer number (72183778212).

Almost surely, 2^216551334633 is an apocalyptic number.

It is an amenable number.

216551334633 is a deficient number, since it is larger than the sum of its proper divisors (72183778215).

216551334633 is an equidigital number, since it uses as much as digits as its factorization.

216551334633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72183778214.

The product of its digits is 583200, while the sum is 42.

The spelling of 216551334633 in words is "two hundred sixteen billion, five hundred fifty-one million, three hundred thirty-four thousand, six hundred thirty-three".