163173171661 has 4 divisors (see below), whose sum is σ = 163243842300. Its totient is φ = 163102501024.

The previous prime is 163173171649. The next prime is 163173171683. The reversal of 163173171661 is 166171371361.

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 55051236900 + 108121934761 = 234630^2 + 328819^2 .

It is a cyclic number.

It is not a de Polignac number, because 163173171661 - 2³³ = 154583237069 is a prime.

It is a super-3 number, since 3×163173171661³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163173171631) 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, 35331856 + ... + 35336473.

It is an arithmetic number, because the mean of its divisors is an integer number (40810960575).

Almost surely, 2^163173171661 is an apocalyptic number.

It is an amenable number.

163173171661 is a deficient number, since it is larger than the sum of its proper divisors (70670639).

163173171661 is an equidigital number, since it uses as much as digits as its factorization.

163173171661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70670638.

The product of its digits is 95256, while the sum is 43.

The spelling of 163173171661 in words is "one hundred sixty-three billion, one hundred seventy-three million, one hundred seventy-one thousand, six hundred sixty-one".