161422210818 has 54 divisors (see below), whose sum is σ = 384478547817. Its totient is φ = 48910139520.

The previous prime is 161422210757. The next prime is 161422210841. The reversal of 161422210818 is 818012224161.

161422210818 is a `hidden beast` number, since 1 + 6 + 1 + 422 + 210 + 8 + 18 = 666.

161422210818 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 149353650369 + 12068560449 = 386463^2 + 109857^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=284097.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 18746098 + ... + 18754706.

Almost surely, 2^161422210818 is an apocalyptic number.

161422210818 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

161422210818 is an abundant number, since it is smaller than the sum of its proper divisors (223056336999).

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

161422210818 is an frugal number, since it uses more digits than its factorization.

161422210818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17248 (or 8625 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 36.

Adding to 161422210818 its reverse (818012224161), we get a palindrome (979434434979).

The spelling of 161422210818 in words is "one hundred sixty-one billion, four hundred twenty-two million, two hundred ten thousand, eight hundred eighteen".