161800818 has 16 divisors (see below), whose sum is σ = 323778720. Its totient is φ = 53904096.

The previous prime is 161800813. The next prime is 161800819. The reversal of 161800818 is 818008161.

It is not an unprimeable number, because it can be changed into a prime (161800813) 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 7 ways as a sum of consecutive naturals, for example, 6513 + ... + 19131.

It is an arithmetic number, because the mean of its divisors is an integer number (20236170).

Almost surely, 2^161800818 is an apocalyptic number.

161800818 is an abundant number, since it is smaller than the sum of its proper divisors (161977902).

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

161800818 is a wasteful number, since it uses less digits than its factorization.

161800818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14761.

The product of its (nonzero) digits is 3072, while the sum is 33.

The square root of 161800818 is about 12720.0950468147. The cubic root of 161800818 is about 544.9126678795.

Adding to 161800818 its reverse (818008161), we get a palindrome (979808979).

The spelling of 161800818 in words is "one hundred sixty-one million, eight hundred thousand, eight hundred eighteen".