161810330 has 32 divisors (see below), whose sum is σ = 318567168. Its totient is φ = 58686400.

The previous prime is 161810329. The next prime is 161810339. The reversal of 161810330 is 33018161.

It is a junction number, because it is equal to n+sod(n) for n = 161810296 and 161810305.

It is not an unprimeable number, because it can be changed into a prime (161810339) 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 15 ways as a sum of consecutive naturals, for example, 45704 + ... + 49116.

It is an arithmetic number, because the mean of its divisors is an integer number (9955224).

Almost surely, 2^161810330 is an apocalyptic number.

161810330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161810330 is a deficient number, since it is larger than the sum of its proper divisors (156756838).

161810330 is a wasteful number, since it uses less digits than its factorization.

161810330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3862.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 161810330 is about 12720.4689378969. The cubic root of 161810330 is about 544.9233458389.

Adding to 161810330 its reverse (33018161), we get a palindrome (194828491).

The spelling of 161810330 in words is "one hundred sixty-one million, eight hundred ten thousand, three hundred thirty".