166563643 has 2 divisors, whose sum is σ = 166563644. Its totient is φ = 166563642.

The previous prime is 166563613. The next prime is 166563703. The reversal of 166563643 is 346365661.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166563643 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 166563596 and 166563605.

It is not a weakly prime, because it can be changed into another prime (166563613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83281821 + 83281822.

It is an arithmetic number, because the mean of its divisors is an integer number (83281822).

Almost surely, 2^166563643 is an apocalyptic number.

166563643 is a deficient number, since it is larger than the sum of its proper divisors (1).

166563643 is an equidigital number, since it uses as much as digits as its factorization.

166563643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 233280, while the sum is 40.

The square root of 166563643 is about 12905.9537811043. The cubic root of 166563643 is about 550.2077925595.

The spelling of 166563643 in words is "one hundred sixty-six million, five hundred sixty-three thousand, six hundred forty-three".