161375500 has 192 divisors, whose sum is σ = 432222336. Its totient is φ = 51840000.

The previous prime is 161375453. The next prime is 161375503. The reversal of 161375500 is 5573161.

161375500 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (161375503) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 2645470 + ... + 2645530.

It is an arithmetic number, because the mean of its divisors is an integer number (2251158).

Almost surely, 2^161375500 is an apocalyptic number.

161375500 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 161375500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (216111168).

161375500 is an abundant number, since it is smaller than the sum of its proper divisors (270846836).

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

161375500 is a wasteful number, since it uses less digits than its factorization.

161375500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141 (or 129 counting only the distinct ones).

The product of its (nonzero) digits is 3150, while the sum is 28.

The square root of 161375500 is about 12703.3656957517. The cubic root of 161375500 is about 544.4347870316.

The spelling of 161375500 in words is "one hundred sixty-one million, three hundred seventy-five thousand, five hundred".