161541434560 has 112 divisors (see below), whose sum is σ = 420846199200. Its totient is φ = 58573578240.

The previous prime is 161541434539. The next prime is 161541434567. The reversal of 161541434560 is 65434145161.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (161541434567) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1162732 + ... + 1294228.

It is an arithmetic number, because the mean of its divisors is an integer number (3757555350).

Almost surely, 2^161541434560 is an apocalyptic number.

161541434560 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 161541434560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (210423099600).

161541434560 is an abundant number, since it is smaller than the sum of its proper divisors (259304764640).

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

161541434560 is a wasteful number, since it uses less digits than its factorization.

161541434560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131874 (or 131864 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 40.

The spelling of 161541434560 in words is "one hundred sixty-one billion, five hundred forty-one million, four hundred thirty-four thousand, five hundred sixty".