216705489771 has 8 divisors (see below), whose sum is σ = 288963063360. Its totient is φ = 144459121352.

The previous prime is 216705489751. The next prime is 216705489811. The reversal of 216705489771 is 177984507612.

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

It is a cyclic number.

It is not a de Polignac number, because 216705489771 - 2¹¹ = 216705487723 is a prime.

It is a super-2 number, since 2×216705489771² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (216705489751) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2756061 + ... + 2833598.

It is an arithmetic number, because the mean of its divisors is an integer number (36120382920).

Almost surely, 2^216705489771 is an apocalyptic number.

216705489771 is a deficient number, since it is larger than the sum of its proper divisors (72257573589).

216705489771 is a wasteful number, since it uses less digits than its factorization.

216705489771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5602585.

The product of its (nonzero) digits is 5927040, while the sum is 57.

The spelling of 216705489771 in words is "two hundred sixteen billion, seven hundred five million, four hundred eighty-nine thousand, seven hundred seventy-one".