161316311312 has 80 divisors (see below), whose sum is σ = 344351710080. Its totient is φ = 72752557056.

The previous prime is 161316311279. The next prime is 161316311327. The reversal of 161316311312 is 213113613161.

It is a happy number.

It is a super-2 number, since 2×161316311312² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2010068 + ... + 2088780.

It is an arithmetic number, because the mean of its divisors is an integer number (4304396376).

Almost surely, 2^161316311312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161316311312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (172175855040).

161316311312 is an abundant number, since it is smaller than the sum of its proper divisors (183035398768).

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

161316311312 is a wasteful number, since it uses less digits than its factorization.

161316311312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78960 (or 78954 counting only the distinct ones).

The product of its digits is 1944, while the sum is 29.

Adding to 161316311312 its reverse (213113613161), we get a palindrome (374429924473).

The spelling of 161316311312 in words is "one hundred sixty-one billion, three hundred sixteen million, three hundred eleven thousand, three hundred twelve".