161428111312 has 20 divisors (see below), whose sum is σ = 336825963460. Its totient is φ = 74505282048.

The previous prime is 161428111309. The next prime is 161428111319. The reversal of 161428111312 is 213111824161.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 70318310976 + 91109800336 = 265176^2 + 301844^2 .

It is a super-2 number, since 2×161428111312² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161428111319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 388048137 + ... + 388048552.

It is an arithmetic number, because the mean of its divisors is an integer number (16841298173).

Almost surely, 2^161428111312 is an apocalyptic number.

It is an amenable number.

161428111312 is an abundant number, since it is smaller than the sum of its proper divisors (175397852148).

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

161428111312 is a wasteful number, since it uses less digits than its factorization.

161428111312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 776096710 (or 776096704 counting only the distinct ones).

The product of its digits is 2304, while the sum is 31.

Adding to 161428111312 its reverse (213111824161), we get a palindrome (374539935473).

The spelling of 161428111312 in words is "one hundred sixty-one billion, four hundred twenty-eight million, one hundred eleven thousand, three hundred twelve".