166766643 has 12 divisors (see below), whose sum is σ = 243018360. Its totient is φ = 110193216.

The previous prime is 166766641. The next prime is 166766653. The reversal of 166766643 is 346667661.

It is not a de Polignac number, because 166766643 - 2¹ = 166766641 is a prime.

It is a super-2 number, since 2×166766643² = 55622226434978898, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (166766641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 80973 + ... + 83006.

It is an arithmetic number, because the mean of its divisors is an integer number (20251530).

Almost surely, 2^166766643 is an apocalyptic number.

166766643 is a deficient number, since it is larger than the sum of its proper divisors (76251717).

166766643 is a wasteful number, since it uses less digits than its factorization.

166766643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164098 (or 164095 counting only the distinct ones).

The product of its digits is 653184, while the sum is 45.

The square root of 166766643 is about 12913.8159735997. The cubic root of 166766643 is about 550.4312243471.

The spelling of 166766643 in words is "one hundred sixty-six million, seven hundred sixty-six thousand, six hundred forty-three".