216808775568 has 120 divisors (see below), whose sum is σ = 756484337856. Its totient is φ = 56313964800.

The previous prime is 216808775567. The next prime is 216808775587. The reversal of 216808775568 is 865577808612.

216808775568 is a `hidden beast` number, since 2 + 1 + 6 + 8 + 0 + 8 + 77 + 556 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (216808775567) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9765643 + ... + 9787818.

Almost surely, 2^216808775568 is an apocalyptic number.

216808775568 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

216808775568 is an abundant number, since it is smaller than the sum of its proper divisors (539675562288).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216808775568 is a wasteful number, since it uses less digits than its factorization.

216808775568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19553493 (or 19553484 counting only the distinct ones).

The product of its (nonzero) digits is 45158400, while the sum is 63.

The spelling of 216808775568 in words is "two hundred sixteen billion, eight hundred eight million, seven hundred seventy-five thousand, five hundred sixty-eight".