216765138918916 has 27 divisors (see below), whose sum is σ = 441272309546439. Its totient is φ = 92899256913288.

The previous prime is 216765138918841. The next prime is 216765138918929. The reversal of 216765138918916 is 619819831567612.

The square root of 216765138918916 is 14722946.

It is a perfect power (a square), and thus also a powerful number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 205595425 + ... + 206647063.

Almost surely, 2^{216765138918916} is an apocalyptic number.

216765138918916 is the 14722946-th square number.

It is an amenable number.

216765138918916 is an abundant number, since it is smaller than the sum of its proper divisors (224507170627523).

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

216765138918916 is an frugal number, since it uses more digits than its factorization.

216765138918916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2103296 (or 1051648 counting only the distinct ones).

The product of its digits is 235146240, while the sum is 73.

The spelling of 216765138918916 in words is "two hundred sixteen trillion, seven hundred sixty-five billion, one hundred thirty-eight million, nine hundred eighteen thousand, nine hundred sixteen".