161105160961 has 4 divisors (see below), whose sum is σ = 161365428400. Its totient is φ = 160844893524.

The previous prime is 161105160917. The next prime is 161105160967. The reversal of 161105160961 is 169061501161.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 169061501161 = 7 ⋅24151643023.

It is a cyclic number.

It is not a de Polignac number, because 161105160961 - 2³¹ = 158957677313 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161105160961.

It is not an unprimeable number, because it can be changed into a prime (161105160967) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130132791 + ... + 130134028.

It is an arithmetic number, because the mean of its divisors is an integer number (40341357100).

Almost surely, 2^161105160961 is an apocalyptic number.

It is an amenable number.

161105160961 is a deficient number, since it is larger than the sum of its proper divisors (260267439).

161105160961 is an equidigital number, since it uses as much as digits as its factorization.

161105160961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260267438.

The product of its (nonzero) digits is 9720, while the sum is 37.

The spelling of 161105160961 in words is "one hundred sixty-one billion, one hundred five million, one hundred sixty thousand, nine hundred sixty-one".