216205161995 has 4 divisors (see below), whose sum is σ = 259446194400. Its totient is φ = 172964129592.

The previous prime is 216205161983. The next prime is 216205162021. The reversal of 216205161995 is 599161502612.

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 216205161995 - 2⁴ = 216205161979 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21620516195 + ... + 21620516204.

It is an arithmetic number, because the mean of its divisors is an integer number (64861548600).

Almost surely, 2^216205161995 is an apocalyptic number.

216205161995 is a deficient number, since it is larger than the sum of its proper divisors (43241032405).

216205161995 is an equidigital number, since it uses as much as digits as its factorization.

216205161995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43241032404.

The product of its (nonzero) digits is 291600, while the sum is 47.

The spelling of 216205161995 in words is "two hundred sixteen billion, two hundred five million, one hundred sixty-one thousand, nine hundred ninety-five".