216133605 has 24 divisors (see below), whose sum is σ = 375013080. Its totient is φ = 115153920.

The previous prime is 216133537. The next prime is 216133633. The reversal of 216133605 is 506331612.

216133605 is a `hidden beast` number, since 21 + 6 + 1 + 33 + 605 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1979649 + 214153956 = 1407^2 + 14634^2 .

It is not a de Polignac number, because 216133605 - 2⁸ = 216133349 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 59481 + ... + 63009.

It is an arithmetic number, because the mean of its divisors is an integer number (15625545).

Almost surely, 2^216133605 is an apocalyptic number.

It is an amenable number.

216133605 is a deficient number, since it is larger than the sum of its proper divisors (158879475).

216133605 is a wasteful number, since it uses less digits than its factorization.

216133605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4901 (or 4898 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 216133605 is about 14701.4830884506. The cubic root of 216133605 is about 600.1236828358.

The spelling of 216133605 in words is "two hundred sixteen million, one hundred thirty-three thousand, six hundred five".