166165946 has 4 divisors (see below), whose sum is σ = 249248922. Its totient is φ = 83082972.

The previous prime is 166165943. The next prime is 166165957. The reversal of 166165946 is 649561661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 649561661 = 7 ⋅92794523.

It can be written as a sum of positive squares in only one way, i.e., 165508225 + 657721 = 12865^2 + 811^2 .

It is a super-2 number, since 2×166165946² = 55222243220149832, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 166165897 and 166165906.

It is not an unprimeable number, because it can be changed into a prime (166165943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41541485 + ... + 41541488.

Almost surely, 2^166165946 is an apocalyptic number.

166165946 is a deficient number, since it is larger than the sum of its proper divisors (83082976).

166165946 is an equidigital number, since it uses as much as digits as its factorization.

166165946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83082975.

The product of its digits is 233280, while the sum is 44.

The square root of 166165946 is about 12890.5370718213. The cubic root of 166165946 is about 549.7695409129.

The spelling of 166165946 in words is "one hundred sixty-six million, one hundred sixty-five thousand, nine hundred forty-six".