216665576600 has 144 divisors (see below), whose sum is σ = 582849544200. Its totient is φ = 74640614400.

The previous prime is 216665576599. The next prime is 216665576641. The reversal of 216665576600 is 6675566612.

It is a Harshad number since it is a multiple of its sum of digits (50).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 224192 + ... + 695408.

Almost surely, 2^216665576600 is an apocalyptic number.

216665576600 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216665576600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (291424772100).

216665576600 is an abundant number, since it is smaller than the sum of its proper divisors (366183967600).

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

216665576600 is a wasteful number, since it uses less digits than its factorization.

216665576600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471274 (or 471254 counting only the distinct ones).

The product of its (nonzero) digits is 2721600, while the sum is 50.

The spelling of 216665576600 in words is "two hundred sixteen billion, six hundred sixty-five million, five hundred seventy-six thousand, six hundred".