166445646 has 8 divisors (see below), whose sum is σ = 332891304. Its totient is φ = 55481880.

The previous prime is 166445593. The next prime is 166445651. The reversal of 166445646 is 646544661.

It is a sphenic number, since it is the product of 3 distinct primes.

166445646 is an admirable number.

It is a super-3 number, since 3×166445646³ (a number of 26 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 166445598 and 166445607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13870465 + ... + 13870476.

It is an arithmetic number, because the mean of its divisors is an integer number (41611413).

Almost surely, 2^166445646 is an apocalyptic number.

166445646 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

166445646 is a wasteful number, since it uses less digits than its factorization.

166445646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27740946.

The product of its digits is 414720, while the sum is 42.

The square root of 166445646 is about 12901.3815539267. The cubic root of 166445646 is about 550.0778358161.

The spelling of 166445646 in words is "one hundred sixty-six million, four hundred forty-five thousand, six hundred forty-six".