166648945 has 8 divisors (see below), whose sum is σ = 200103336. Its totient is φ = 133236096.

The previous prime is 166648939. The next prime is 166648949. The reversal of 166648945 is 549846661.

It can be written as a sum of positive squares in 4 ways, for example, as 22240656 + 144408289 = 4716^2 + 12017^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 166648945 - 2⁷ = 166648817 is a prime.

It is a super-2 number, since 2×166648945² = 55543741739226050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166648949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 742 + ... + 18271.

It is an arithmetic number, because the mean of its divisors is an integer number (25012917).

Almost surely, 2^166648945 is an apocalyptic number.

It is an amenable number.

166648945 is a deficient number, since it is larger than the sum of its proper divisors (33454391).

166648945 is a wasteful number, since it uses less digits than its factorization.

166648945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20771.

The product of its digits is 1244160, while the sum is 49.

The square root of 166648945 is about 12909.2581119133. The cubic root of 166648945 is about 550.3017022397.

The spelling of 166648945 in words is "one hundred sixty-six million, six hundred forty-eight thousand, nine hundred forty-five".