161564324111 has 6 divisors (see below), whose sum is σ = 165601031136. Its totient is φ = 157623729200.

The previous prime is 161564324099. The next prime is 161564324123. The reversal of 161564324111 is 111423465161.

It is an interprime number because it is at equal distance from previous prime (161564324099) and next prime (161564324123).

It is not a de Polignac number, because 161564324111 - 2¹⁴ = 161564307727 is a prime.

It is a super-2 number, since 2×161564324111² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161564324161) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 48054335 + ... + 48057696.

It is an arithmetic number, because the mean of its divisors is an integer number (27600171856).

Almost surely, 2^161564324111 is an apocalyptic number.

161564324111 is a deficient number, since it is larger than the sum of its proper divisors (4036707025).

161564324111 is an frugal number, since it uses more digits than its factorization.

161564324111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96112113 (or 96112072 counting only the distinct ones).

The product of its digits is 17280, while the sum is 35.

Adding to 161564324111 its reverse (111423465161), we get a palindrome (272987789272).

The spelling of 161564324111 in words is "one hundred sixty-one billion, five hundred sixty-four million, three hundred twenty-four thousand, one hundred eleven".