161704730177 has 4 divisors (see below), whose sum is σ = 161915010180. Its totient is φ = 161494450176.

The previous prime is 161704730171. The next prime is 161704730221. The reversal of 161704730177 is 771037407161.

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 53939598001 + 107765132176 = 232249^2 + 328276^2 .

It is a cyclic number.

It is not a de Polignac number, because 161704730177 - 2¹⁸ = 161704468033 is a prime.

It is a super-2 number, since 2×161704730177² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161704730171) 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, 105138848 + ... + 105140385.

It is an arithmetic number, because the mean of its divisors is an integer number (40478752545).

Almost surely, 2^161704730177 is an apocalyptic number.

It is an amenable number.

161704730177 is a deficient number, since it is larger than the sum of its proper divisors (210280003).

161704730177 is an equidigital number, since it uses as much as digits as its factorization.

161704730177 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210280002.

The product of its (nonzero) digits is 172872, while the sum is 44.

The spelling of 161704730177 in words is "one hundred sixty-one billion, seven hundred four million, seven hundred thirty thousand, one hundred seventy-seven".