161328136320 has 256 divisors, whose sum is σ = 615322915200. Its totient is φ = 39711485952.

The previous prime is 161328136303. The next prime is 161328136339. The reversal of 161328136320 is 23631823161.

161328136320 is a `hidden beast` number, since 1 + 6 + 1 + 3 + 2 + 8 + 13 + 632 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 134442 + ... + 583721.

Almost surely, 2^161328136320 is an apocalyptic number.

161328136320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161328136320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (307661457600).

161328136320 is an abundant number, since it is smaller than the sum of its proper divisors (453994778880).

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

161328136320 is a wasteful number, since it uses less digits than its factorization.

161328136320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 718204 (or 718186 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

Adding to 161328136320 its reverse (23631823161), we get a palindrome (184959959481).

The spelling of 161328136320 in words is "one hundred sixty-one billion, three hundred twenty-eight million, one hundred thirty-six thousand, three hundred twenty".