161605501111107 has 28 divisors (see below), whose sum is σ = 242299487477880. Its totient is φ = 107736077498688.

The previous prime is 161605501111099. The next prime is 161605501111133. The reversal of 161605501111107 is 701111105506161.

161605501111107 is a `hidden beast` number, since 1 + 616 + 0 + 5 + 5 + 0 + 11 + 11 + 10 + 7 = 666.

It is not a de Polignac number, because 161605501111107 - 2³ = 161605501111099 is a prime.

It is a super-2 number, since 2×161605501111107² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161605501116107) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 90169819 + ... + 91944587.

It is an arithmetic number, because the mean of its divisors is an integer number (8653553124210).

Almost surely, 2^{161605501111107} is an apocalyptic number.

161605501111107 is a deficient number, since it is larger than the sum of its proper divisors (80693986366773).

161605501111107 is an equidigital number, since it uses as much as digits as its factorization.

161605501111107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1899694 (or 1899679 counting only the distinct ones).

The product of its (nonzero) digits is 6300, while the sum is 36.

Adding to 161605501111107 its reverse (701111105506161), we get a palindrome (862716606617268).

The spelling of 161605501111107 in words is "one hundred sixty-one trillion, six hundred five billion, five hundred one million, one hundred eleven thousand, one hundred seven".