161764166 has 4 divisors (see below), whose sum is σ = 242646252. Its totient is φ = 80882082.

The previous prime is 161764159. The next prime is 161764201. The reversal of 161764166 is 661467161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 661467161 = 17 ⋅38909833.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40441040 + ... + 40441043.

It is an arithmetic number, because the mean of its divisors is an integer number (60661563).

Almost surely, 2^161764166 is an apocalyptic number.

161764166 is a deficient number, since it is larger than the sum of its proper divisors (80882086).

161764166 is an equidigital number, since it uses as much as digits as its factorization.

161764166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80882085.

The product of its digits is 36288, while the sum is 38.

The square root of 161764166 is about 12718.6542527109. The cubic root of 161764166 is about 544.8715192466.

The spelling of 161764166 in words is "one hundred sixty-one million, seven hundred sixty-four thousand, one hundred sixty-six".