216284973985 has 8 divisors (see below), whose sum is σ = 260499689856. Its totient is φ = 172389498480.

The previous prime is 216284973941. The next prime is 216284973997. The reversal of 216284973985 is 589379482612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 216284973985 - 2¹¹ = 216284971937 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79808599 + ... + 79811308.

It is an arithmetic number, because the mean of its divisors is an integer number (32562461232).

Almost surely, 2^216284973985 is an apocalyptic number.

It is an amenable number.

216284973985 is a deficient number, since it is larger than the sum of its proper divisors (44214715871).

216284973985 is a wasteful number, since it uses less digits than its factorization.

216284973985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159620183.

The product of its digits is 52254720, while the sum is 64.

The spelling of 216284973985 in words is "two hundred sixteen billion, two hundred eighty-four million, nine hundred seventy-three thousand, nine hundred eighty-five".