161271310228 has 24 divisors (see below), whose sum is σ = 325674108032. Its totient is φ = 68445242784.

The previous prime is 161271310223. The next prime is 161271310247. The reversal of 161271310228 is 822013172161.

It is a junction number, because it is equal to n+sod(n) for n = 161271310193 and 161271310202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161271310223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27956775 + ... + 27962542.

Almost surely, 2^161271310228 is an apocalyptic number.

It is an amenable number.

161271310228 is an abundant number, since it is smaller than the sum of its proper divisors (164402797804).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161271310228 is a wasteful number, since it uses less digits than its factorization.

161271310228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55919431 (or 55919429 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 34.

Adding to 161271310228 its reverse (822013172161), we get a palindrome (983284482389).

The spelling of 161271310228 in words is "one hundred sixty-one billion, two hundred seventy-one million, three hundred ten thousand, two hundred twenty-eight".