161844567552 has 180 divisors, whose sum is σ = 474927504480. Its totient is φ = 53058170880.

The previous prime is 161844567551. The next prime is 161844567559. The reversal of 161844567552 is 255765448161.

161844567552 is a `hidden beast` number, since 1 + 6 + 1 + 84 + 4 + 5 + 6 + 7 + 552 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161844567551) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 17141649 + ... + 17151087.

It is an arithmetic number, because the mean of its divisors is an integer number (2638486136).

Almost surely, 2^161844567552 is an apocalyptic number.

161844567552 is a gapful number since it is divisible by the number (12) 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 161844567552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (237463752240).

161844567552 is an abundant number, since it is smaller than the sum of its proper divisors (313082936928).

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

161844567552 is an frugal number, since it uses more digits than its factorization.

161844567552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9585 (or 9505 counting only the distinct ones).

The product of its digits is 8064000, while the sum is 54.

The spelling of 161844567552 in words is "one hundred sixty-one billion, eight hundred forty-four million, five hundred sixty-seven thousand, five hundred fifty-two".