161794604169 has 135 divisors (see below), whose sum is σ = 283394945911. Its totient is φ = 91903109760.

The previous prime is 161794604119. The next prime is 161794604183. The reversal of 161794604169 is 961406497161.

The square root of 161794604169 is 402237.

It is a perfect power (a square), and thus also a powerful number.

161794604169 is a `hidden beast` number, since 1 + 6 + 17 + 9 + 4 + 604 + 16 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 125964657225 + 35829946944 = 354915^2 + 189288^2 .

It is not a de Polignac number, because 161794604169 - 2¹⁷ = 161794473097 is a prime.

It is a super-2 number, since 2×161794604169² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161794604119) by changing a digit.

It is a polite number, since it can be written in 134 ways as a sum of consecutive naturals, for example, 676964752 + ... + 676964990.

Almost surely, 2^161794604169 is an apocalyptic number.

161794604169 is the 402237-th square number.

161794604169 is the 201119-th centered octagonal number.

It is an amenable number.

161794604169 is a deficient number, since it is larger than the sum of its proper divisors (121600341742).

161794604169 is an equidigital number, since it uses as much as digits as its factorization.

161794604169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546 (or 270 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 54.

The spelling of 161794604169 in words is "one hundred sixty-one billion, seven hundred ninety-four million, six hundred four thousand, one hundred sixty-nine".