161611160511605 has 32 divisors (see below), whose sum is σ = 221691166920960. Its totient is φ = 110792582991360.

The previous prime is 161611160511601. The next prime is 161611160511733. The reversal of 161611160511605 is 506115061116161.

It is not a de Polignac number, because 161611160511605 - 2² = 161611160511601 is a prime.

It is a super-2 number, since 2×161611160511605² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161611160511601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3050334215 + ... + 3050387195.

It is an arithmetic number, because the mean of its divisors is an integer number (6927848966280).

Almost surely, 2^{161611160511605} is an apocalyptic number.

It is an amenable number.

161611160511605 is a deficient number, since it is larger than the sum of its proper divisors (60080006409355).

161611160511605 is a wasteful number, since it uses less digits than its factorization.

161611160511605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72189.

The product of its (nonzero) digits is 32400, while the sum is 41.

The spelling of 161611160511605 in words is "one hundred sixty-one trillion, six hundred eleven billion, one hundred sixty million, five hundred eleven thousand, six hundred five".