166145643 has 6 divisors (see below), whose sum is σ = 239988164. Its totient is φ = 110763756.

The previous prime is 166145627. The next prime is 166145657. The reversal of 166145643 is 346541661.

It is a happy number.

166145643 is a `hidden beast` number, since 1 + 6 + 6 + 1 + 4 + 5 + 643 = 666.

It is not a de Polignac number, because 166145643 - 2⁴ = 166145627 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166145598 and 166145607.

It is not an unprimeable number, because it can be changed into a prime (166143643) 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 5 ways as a sum of consecutive naturals, for example, 9230305 + ... + 9230322.

Almost surely, 2^166145643 is an apocalyptic number.

166145643 is a deficient number, since it is larger than the sum of its proper divisors (73842521).

166145643 is a wasteful number, since it uses less digits than its factorization.

166145643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18460633 (or 18460630 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 166145643 is about 12889.7495320894. The cubic root of 166145643 is about 549.7471487884.

The spelling of 166145643 in words is "one hundred sixty-six million, one hundred forty-five thousand, six hundred forty-three".