161644296839760 has 800 divisors, whose sum is σ = 657700836452352. Its totient is φ = 36022260695040.

The previous prime is 161644296839651. The next prime is 161644296839789. The reversal of 161644296839760 is 67938692446161.

161644296839760 is a `hidden beast` number, since 1 + 6 + 1 + 6 + 442 + 96 + 8 + 3 + 97 + 6 + 0 = 666.

It is a super-2 number, since 2×161644296839760² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 2888179297 + ... + 2888235263.

Almost surely, 2^{161644296839760} is an apocalyptic number.

161644296839760 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 161644296839760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (328850418226176).

161644296839760 is an abundant number, since it is smaller than the sum of its proper divisors (496056539612592).

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

161644296839760 is a wasteful number, since it uses less digits than its factorization.

161644296839760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57593 (or 57578 counting only the distinct ones).

The product of its (nonzero) digits is 564350976, while the sum is 72.

The spelling of 161644296839760 in words is "one hundred sixty-one trillion, six hundred forty-four billion, two hundred ninety-six million, eight hundred thirty-nine thousand, seven hundred sixty".