216363780217 has 16 divisors (see below), whose sum is σ = 248792277888. Its totient is φ = 186594186240.

The previous prime is 216363780119. The next prime is 216363780299. The reversal of 216363780217 is 712087363612.

It is a happy number.

It is not a de Polignac number, because 216363780217 - 2¹⁹ = 216363255929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216363780817) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8401384 + ... + 8427097.

It is an arithmetic number, because the mean of its divisors is an integer number (15549517368).

Almost surely, 2^216363780217 is an apocalyptic number.

It is an amenable number.

216363780217 is a deficient number, since it is larger than the sum of its proper divisors (32428497671).

216363780217 is a wasteful number, since it uses less digits than its factorization.

216363780217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16828560.

The product of its (nonzero) digits is 508032, while the sum is 46.

The spelling of 216363780217 in words is "two hundred sixteen billion, three hundred sixty-three million, seven hundred eighty thousand, two hundred seventeen".