216133551 has 6 divisors (see below), whose sum is σ = 312192920. Its totient is φ = 144089028.

The previous prime is 216133537. The next prime is 216133633. The reversal of 216133551 is 155331612.

216133551 is a `hidden beast` number, since 21 + 61 + 33 + 551 = 666.

It is not a de Polignac number, because 216133551 - 2⁶ = 216133487 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 (216133051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12007411 + ... + 12007428.

Almost surely, 2^216133551 is an apocalyptic number.

216133551 is a deficient number, since it is larger than the sum of its proper divisors (96059369).

216133551 is a wasteful number, since it uses less digits than its factorization.

216133551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24014845 (or 24014842 counting only the distinct ones).

The product of its digits is 2700, while the sum is 27.

The square root of 216133551 is about 14701.4812519011. The cubic root of 216133551 is about 600.1236328564.

The spelling of 216133551 in words is "two hundred sixteen million, one hundred thirty-three thousand, five hundred fifty-one".