161601115111161 has 32 divisors (see below), whose sum is σ = 236134783180800. Its totient is φ = 97491176263680.

The previous prime is 161601115111151. The next prime is 161601115111181. The reversal of 161601115111161 is 161111511106161.

It is not a de Polignac number, because 161601115111161 - 2¹¹ = 161601115109113 is a prime.

It is a super-2 number, since 2×161601115111161² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (161601115111151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5583420 + ... + 18824898.

It is an arithmetic number, because the mean of its divisors is an integer number (7379211974400).

Almost surely, 2^{161601115111161} is an apocalyptic number.

161601115111161 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

161601115111161 is a deficient number, since it is larger than the sum of its proper divisors (74533668069639).

161601115111161 is a wasteful number, since it uses less digits than its factorization.

161601115111161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13243189.

The product of its (nonzero) digits is 1080, while the sum is 33.

The spelling of 161601115111161 in words is "one hundred sixty-one trillion, six hundred one billion, one hundred fifteen million, one hundred eleven thousand, one hundred sixty-one".