161032561536 has 384 divisors, whose sum is σ = 543464812800. Its totient is φ = 41349242880.

The previous prime is 161032561507. The next prime is 161032561553. The reversal of 161032561536 is 635165230161.

It is a tau number, because it is divible by the number of its divisors (384).

It is a junction number, because it is equal to n+sod(n) for n = 161032561494 and 161032561503.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 28944291 + ... + 28949853.

It is an arithmetic number, because the mean of its divisors is an integer number (1415272950).

Almost surely, 2^161032561536 is an apocalyptic number.

161032561536 is a gapful number since it is divisible by the number (16) 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 161032561536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (271732406400).

161032561536 is an abundant number, since it is smaller than the sum of its proper divisors (382432251264).

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

161032561536 is a wasteful number, since it uses less digits than its factorization.

161032561536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5698 (or 5675 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 39.

Adding to 161032561536 its reverse (635165230161), we get a palindrome (796197791697).

The spelling of 161032561536 in words is "one hundred sixty-one billion, thirty-two million, five hundred sixty-one thousand, five hundred thirty-six".