161545120841 has 6 divisors (see below), whose sum is σ = 174927557070. Its totient is φ = 149118572928.

The previous prime is 161545120837. The next prime is 161545120871. The reversal of 161545120841 is 148021545161.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 8530369600 + 153014751241 = 92360^2 + 391171^2 .

It is not a de Polignac number, because 161545120841 - 2² = 161545120837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161545120795 and 161545120804.

It is not an unprimeable number, because it can be changed into a prime (161545120811) 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, 477943976 + ... + 477944313.

It is an arithmetic number, because the mean of its divisors is an integer number (29154592845).

Almost surely, 2^161545120841 is an apocalyptic number.

It is an amenable number.

161545120841 is a deficient number, since it is larger than the sum of its proper divisors (13382436229).

161545120841 is an equidigital number, since it uses as much as digits as its factorization.

161545120841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 955888315 (or 955888302 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 38.

The spelling of 161545120841 in words is "one hundred sixty-one billion, five hundred forty-five million, one hundred twenty thousand, eight hundred forty-one".