161055520 has 48 divisors (see below), whose sum is σ = 385733880. Its totient is φ = 63535104.

The previous prime is 161055497. The next prime is 161055523. The reversal of 161055520 is 25550161.

It can be written as a sum of positive squares in 4 ways, for example, as 158659216 + 2396304 = 12596^2 + 1548^2 .

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (161055523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4786 + ... + 18574.

Almost surely, 2^161055520 is an apocalyptic number.

161055520 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 161055520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (192866940).

161055520 is an abundant number, since it is smaller than the sum of its proper divisors (224678360).

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

161055520 is a wasteful number, since it uses less digits than its factorization.

161055520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13877 (or 13869 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 25.

The square root of 161055520 is about 12690.7651463574. The cubic root of 161055520 is about 544.0747085978.

The spelling of 161055520 in words is "one hundred sixty-one million, fifty-five thousand, five hundred twenty".