161105066209 has 16 divisors (see below), whose sum is σ = 172353126400. Its totient is φ = 150140186064.

The previous prime is 161105066207. The next prime is 161105066233. The reversal of 161105066209 is 902660501161.

It is not a de Polignac number, because 161105066209 - 2¹ = 161105066207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161105066207) 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, 838432 + ... + 1012510.

It is an arithmetic number, because the mean of its divisors is an integer number (10772070400).

Almost surely, 2^161105066209 is an apocalyptic number.

161105066209 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

161105066209 is a deficient number, since it is larger than the sum of its proper divisors (11248060191).

161105066209 is a wasteful number, since it uses less digits than its factorization.

161105066209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174892.

The product of its (nonzero) digits is 19440, while the sum is 37.

The spelling of 161105066209 in words is "one hundred sixty-one billion, one hundred five million, sixty-six thousand, two hundred nine".