216613334655 has 96 divisors (see below), whose sum is σ = 384259599360. Its totient is φ = 112858686720.

The previous prime is 216613334621. The next prime is 216613334699. The reversal of 216613334655 is 556433316612.

216613334655 is a `hidden beast` number, since 21 + 6 + 613 + 3 + 3 + 4 + 6 + 5 + 5 = 666.

It is not a de Polignac number, because 216613334655 - 2¹⁰ = 216613333631 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 216613334655.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 146063544 + ... + 146065026.

It is an arithmetic number, because the mean of its divisors is an integer number (4002704160).

Almost surely, 2^216613334655 is an apocalyptic number.

216613334655 is a deficient number, since it is larger than the sum of its proper divisors (167646264705).

216613334655 is a wasteful number, since it uses less digits than its factorization.

216613334655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1981 (or 1978 counting only the distinct ones).

The product of its digits is 1166400, while the sum is 45.

The spelling of 216613334655 in words is "two hundred sixteen billion, six hundred thirteen million, three hundred thirty-four thousand, six hundred fifty-five".