161172066 has 32 divisors (see below), whose sum is σ = 360230976. Its totient is φ = 47648000.

The previous prime is 161172023. The next prime is 161172083. The reversal of 161172066 is 660271161.

It is a Curzon 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 in 15 ways as a sum of consecutive naturals, for example, 27075 + ... + 32486.

It is an arithmetic number, because the mean of its divisors is an integer number (11257218).

Almost surely, 2^161172066 is an apocalyptic number.

161172066 is an abundant number, since it is smaller than the sum of its proper divisors (199058910).

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

161172066 is a wasteful number, since it uses less digits than its factorization.

161172066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59618.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 161172066 is about 12695.3560800790. The cubic root of 161172066 is about 544.2059147845.

The spelling of 161172066 in words is "one hundred sixty-one million, one hundred seventy-two thousand, sixty-six".