161223525322161 has 16 divisors (see below), whose sum is σ = 216375936663744. Its totient is φ = 106776998138304.

The previous prime is 161223525322159. The next prime is 161223525322163.

161223525322161 is nontrivially palindromic in base 10.

161223525322161 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (161223525322159) and next prime (161223525322163).

It is not a de Polignac number, because 161223525322161 - 2¹ = 161223525322159 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161223525322163) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30828190 + ... + 35676663.

It is an arithmetic number, because the mean of its divisors is an integer number (13523496041484).

Almost surely, 2^{161223525322161} is an apocalyptic number.

It is an amenable number.

161223525322161 is a deficient number, since it is larger than the sum of its proper divisors (55152411341583).

161223525322161 is a wasteful number, since it uses less digits than its factorization.

161223525322161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66510160.

The product of its digits is 259200, while the sum is 42.

The spelling of 161223525322161 in words is "one hundred sixty-one trillion, two hundred twenty-three billion, five hundred twenty-five million, three hundred twenty-two thousand, one hundred sixty-one".