216561872159 has 4 divisors (see below), whose sum is σ = 219303161760. Its totient is φ = 213820582560.

The previous prime is 216561872141. The next prime is 216561872167. The reversal of 216561872159 is 951278165612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 216561872159 - 2²⁴ = 216545094943 is a prime.

It is a super-2 number, since 2×216561872159² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 216561872159.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216561572159) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1370644682 + ... + 1370644839.

It is an arithmetic number, because the mean of its divisors is an integer number (54825790440).

Almost surely, 2^216561872159 is an apocalyptic number.

216561872159 is a deficient number, since it is larger than the sum of its proper divisors (2741289601).

216561872159 is an equidigital number, since it uses as much as digits as its factorization.

216561872159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2741289600.

The product of its digits is 1814400, while the sum is 53.

The spelling of 216561872159 in words is "two hundred sixteen billion, five hundred sixty-one million, eight hundred seventy-two thousand, one hundred fifty-nine".