161302216205 has 32 divisors (see below), whose sum is σ = 217676422656. Its totient is φ = 113852116224.

The previous prime is 161302216199. The next prime is 161302216249. The reversal of 161302216205 is 502612203161.

It is a cyclic number.

It is not a de Polignac number, because 161302216205 - 2⁴ = 161302216189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2013344 + ... + 2091926.

It is an arithmetic number, because the mean of its divisors is an integer number (6802388208).

Almost surely, 2^161302216205 is an apocalyptic number.

It is an amenable number.

161302216205 is a deficient number, since it is larger than the sum of its proper divisors (56374206451).

161302216205 is a wasteful number, since it uses less digits than its factorization.

161302216205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79997.

The product of its (nonzero) digits is 4320, while the sum is 29.

Adding to 161302216205 its reverse (502612203161), we get a palindrome (663914419366).

The spelling of 161302216205 in words is "one hundred sixty-one billion, three hundred two million, two hundred sixteen thousand, two hundred five".