161389066 has 4 divisors (see below), whose sum is σ = 242083602. Its totient is φ = 80694532.

The previous prime is 161389051. The next prime is 161389121. The reversal of 161389066 is 660983161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 660983161 = 167 ⋅3957983.

It can be written as a sum of positive squares in only one way, i.e., 160757041 + 632025 = 12679^2 + 795^2 .

It is a super-3 number, since 3×161389066³ (a number of 26 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 40347265 + ... + 40347268.

Almost surely, 2^161389066 is an apocalyptic number.

161389066 is a deficient number, since it is larger than the sum of its proper divisors (80694536).

161389066 is an equidigital number, since it uses as much as digits as its factorization.

161389066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80694535.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 161389066 is about 12703.8996375129. The cubic root of 161389066 is about 544.4500425389.

The spelling of 161389066 in words is "one hundred sixty-one million, three hundred eighty-nine thousand, sixty-six".