161831455344 has 180 divisors, whose sum is σ = 491358907416. Its totient is φ = 49699173888.

The previous prime is 161831455327. The next prime is 161831455367. The reversal of 161831455344 is 443554138161.

It is a happy number.

161831455344 is a `hidden beast` number, since 1 + 6 + 1 + 83 + 14 + 553 + 4 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 161831455344.

It is a congruent number.

It is an unprimeable number.

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 35 ways as a sum of consecutive naturals, for example, 13305714 + ... + 13317870.

Almost surely, 2^161831455344 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 161831455344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (245679453708).

161831455344 is an abundant number, since it is smaller than the sum of its proper divisors (329527452072).

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

161831455344 is a wasteful number, since it uses less digits than its factorization.

161831455344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12744 (or 12722 counting only the distinct ones).

The product of its digits is 691200, while the sum is 45.

The spelling of 161831455344 in words is "one hundred sixty-one billion, eight hundred thirty-one million, four hundred fifty-five thousand, three hundred forty-four".