216161867 has 4 divisors (see below), whose sum is σ = 216815256. Its totient is φ = 215508480.

The previous prime is 216161863. The next prime is 216161873. The reversal of 216161867 is 768161612.

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 216161867 - 2² = 216161863 is a prime.

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 216161867.

It is not an unprimeable number, because it can be changed into a prime (216161861) 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, 326198 + ... + 326859.

It is an arithmetic number, because the mean of its divisors is an integer number (54203814).

Almost surely, 2^216161867 is an apocalyptic number.

216161867 is a deficient number, since it is larger than the sum of its proper divisors (653389).

216161867 is an equidigital number, since it uses as much as digits as its factorization.

216161867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 653388.

The product of its digits is 24192, while the sum is 38.

The square root of 216161867 is about 14702.4442525724. Note that the first 3 decimals coincide. The cubic root of 216161867 is about 600.1498394290.

The spelling of 216161867 in words is "two hundred sixteen million, one hundred sixty-one thousand, eight hundred sixty-seven".