161860876369920 has 4608 divisors, whose sum is σ = 769636413020160. Its totient is φ = 31701690482688.

The previous prime is 161860876369909. The next prime is 161860876369939. The reversal of 161860876369920 is 29963678068161.

161860876369920 is a `hidden beast` number, since 1 + 6 + 1 + 8 + 608 + 7 + 6 + 3 + 6 + 9 + 9 + 2 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (4608).

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

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 2217272279004 + ... + 2217272279076.

It is an arithmetic number, because the mean of its divisors is an integer number (167021791020).

Almost surely, 2^{161860876369920} is an apocalyptic number.

161860876369920 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 161860876369920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (384818206510080).

161860876369920 is an abundant number, since it is smaller than the sum of its proper divisors (607775536650240).

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

161860876369920 is an frugal number, since it uses more digits than its factorization.

161860876369920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170 (or 120 counting only the distinct ones).

The product of its (nonzero) digits is 282175488, while the sum is 72.

The spelling of 161860876369920 in words is "one hundred sixty-one trillion, eight hundred sixty billion, eight hundred seventy-six million, three hundred sixty-nine thousand, nine hundred twenty".