161605595111105 has 16 divisors (see below), whose sum is σ = 193977636136704. Its totient is φ = 129250529842560.

The previous prime is 161605595111087. The next prime is 161605595111117. The reversal of 161605595111105 is 501111595506161.

It is not a de Polignac number, because 161605595111105 - 2¹⁰ = 161605595110081 is a prime.

It is a super-2 number, since 2×161605595111105² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 161605595111105.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 945236309 + ... + 945407261.

It is an arithmetic number, because the mean of its divisors is an integer number (12123602258544).

Almost surely, 2^{161605595111105} is an apocalyptic number.

It is an amenable number.

161605595111105 is a deficient number, since it is larger than the sum of its proper divisors (32372041025599).

161605595111105 is a wasteful number, since it uses less digits than its factorization.

161605595111105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219496.

The product of its (nonzero) digits is 202500, while the sum is 47.

The spelling of 161605595111105 in words is "one hundred sixty-one trillion, six hundred five billion, five hundred ninety-five million, one hundred eleven thousand, one hundred five".