161744487821280 has 864 divisors, whose sum is σ = 700929998705664. Its totient is φ = 33658811891712.

The previous prime is 161744487821227. The next prime is 161744487821321. The reversal of 161744487821280 is 82128784447161.

161744487821280 is a `hidden beast` number, since 1 + 6 + 1 + 74 + 4 + 487 + 8 + 2 + 1 + 2 + 80 = 666.

It is a super-2 number, since 2×161744487821280² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 65753697 + ... + 68169183.

It is an arithmetic number, because the mean of its divisors is an integer number (811261572576).

Almost surely, 2^{161744487821280} is an apocalyptic number.

161744487821280 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 161744487821280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (350464999352832).

161744487821280 is an abundant number, since it is smaller than the sum of its proper divisors (539185510884384).

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

161744487821280 is a wasteful number, since it uses less digits than its factorization.

161744487821280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2415608 (or 2415590 counting only the distinct ones).

The product of its (nonzero) digits is 38535168, while the sum is 63.

The spelling of 161744487821280 in words is "one hundred sixty-one trillion, seven hundred forty-four billion, four hundred eighty-seven million, eight hundred twenty-one thousand, two hundred eighty".