161969359747105 has 4 divisors (see below), whose sum is σ = 194363231696532. Its totient is φ = 129575487797680.

The previous prime is 161969359747007. The next prime is 161969359747109. The reversal of 161969359747105 is 501747953969161.

161969359747105 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24959736224784 + 137009623522321 = 4995972^2 + 11705111^2 .

It is not a de Polignac number, because 161969359747105 - 2¹³ = 161969359738913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161969359747109) 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, 16196935974706 + ... + 16196935974715.

It is an arithmetic number, because the mean of its divisors is an integer number (48590807924133).

Almost surely, 2^{161969359747105} is an apocalyptic number.

It is an amenable number.

161969359747105 is a deficient number, since it is larger than the sum of its proper divisors (32393871949427).

161969359747105 is an equidigital number, since it uses as much as digits as its factorization.

161969359747105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32393871949426.

The product of its (nonzero) digits is 385786800, while the sum is 73.

The spelling of 161969359747105 in words is "one hundred sixty-one trillion, nine hundred sixty-nine billion, three hundred fifty-nine million, seven hundred forty-seven thousand, one hundred five".