216686616795904 has 108 divisors (see below), whose sum is σ = 453224175117840. Its totient is φ = 103371617126400.

The previous prime is 216686616795899. The next prime is 216686616795949. The reversal of 216686616795904 is 409597616686612.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11264442 + ... + 23669830.

It is an arithmetic number, because the mean of its divisors is an integer number (4196520139980).

Almost surely, 2^{216686616795904} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216686616795904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (226612087558920).

216686616795904 is an abundant number, since it is smaller than the sum of its proper divisors (236537558321936).

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

216686616795904 is an equidigital number, since it uses as much as digits as its factorization.

216686616795904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12405538 (or 12405493 counting only the distinct ones).

The product of its (nonzero) digits is 1410877440, while the sum is 76.

The spelling of 216686616795904 in words is "two hundred sixteen trillion, six hundred eighty-six billion, six hundred sixteen million, seven hundred ninety-five thousand, nine hundred four".