161563776120 has 160 divisors (see below), whose sum is σ = 543506483520. Its totient is φ = 43046173440.

The previous prime is 161563776113. The next prime is 161563776137. The reversal of 161563776120 is 21677365161.

161563776120 is a `hidden beast` number, since 1 + 6 + 1 + 5 + 637 + 7 + 6 + 1 + 2 + 0 = 666.

It is a super-2 number, since 2×161563776120² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 3805329 + ... + 3847551.

It is an arithmetic number, because the mean of its divisors is an integer number (3396915522).

Almost surely, 2^161563776120 is an apocalyptic number.

161563776120 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 161563776120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (271753241760).

161563776120 is an abundant number, since it is smaller than the sum of its proper divisors (381942707400).

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

161563776120 is a wasteful number, since it uses less digits than its factorization.

161563776120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43427 (or 43414 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 45.

The spelling of 161563776120 in words is "one hundred sixty-one billion, five hundred sixty-three million, seven hundred seventy-six thousand, one hundred twenty".