161534435161 has 32 divisors (see below), whose sum is σ = 184096972800. Its totient is φ = 140405529600.

The previous prime is 161534435141. The next prime is 161534435191.

It is a happy number.

161534435161 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 161534435161 - 2⁵ = 161534435129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161534435141) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15765106 + ... + 15775348.

It is an arithmetic number, because the mean of its divisors is an integer number (5753030400).

Almost surely, 2^161534435161 is an apocalyptic number.

161534435161 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

161534435161 is a deficient number, since it is larger than the sum of its proper divisors (22562537639).

161534435161 is a wasteful number, since it uses less digits than its factorization.

161534435161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10837.

The product of its digits is 129600, while the sum is 40.

It can be divided in two parts, 161534 and 435161, that added together give a palindrome (596695).

The spelling of 161534435161 in words is "one hundred sixty-one billion, five hundred thirty-four million, four hundred thirty-five thousand, one hundred sixty-one".