161605511166105 has 24 divisors (see below), whose sum is σ = 280119160601280. Its totient is φ = 86188700956320.

The previous prime is 161605511166061. The next prime is 161605511166119. The reversal of 161605511166105 is 501661115506161.

161605511166105 is a `hidden beast` number, since 1 + 6 + 1 + 6 + 0 + 5 + 5 + 11 + 16 + 610 + 5 = 666.

It is not a de Polignac number, because 161605511166105 - 2¹⁰ = 161605511165081 is a prime.

It is a super-2 number, since 2×161605511166105² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14509851 + ... + 23102960.

It is an arithmetic number, because the mean of its divisors is an integer number (11671631691720).

Almost surely, 2^{161605511166105} is an apocalyptic number.

161605511166105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161605511166105 is a deficient number, since it is larger than the sum of its proper divisors (118513649435175).

161605511166105 is a wasteful number, since it uses less digits than its factorization.

161605511166105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37708301 (or 37708298 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 45.

The spelling of 161605511166105 in words is "one hundred sixty-one trillion, six hundred five billion, five hundred eleven million, one hundred sixty-six thousand, one hundred five".