166650644 has 6 divisors (see below), whose sum is σ = 291638634. Its totient is φ = 83325320.

The previous prime is 166650619. The next prime is 166650647. The reversal of 166650644 is 446056661.

166650644 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 149328400 + 17322244 = 12220^2 + 4162^2 .

It is a super-2 number, since 2×166650644² = 55544874291229472, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 166650598 and 166650607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166650647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20831327 + ... + 20831334.

It is an arithmetic number, because the mean of its divisors is an integer number (48606439).

Almost surely, 2^166650644 is an apocalyptic number.

It is an amenable number.

166650644 is a deficient number, since it is larger than the sum of its proper divisors (124987990).

166650644 is a wasteful number, since it uses less digits than its factorization.

166650644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41662665 (or 41662663 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 38.

The square root of 166650644 is about 12909.3239172313. The cubic root of 166650644 is about 550.3035723574.

The spelling of 166650644 in words is "one hundred sixty-six million, six hundred fifty thousand, six hundred forty-four".