163666543 has 2 divisors, whose sum is σ = 163666544. Its totient is φ = 163666542.

The previous prime is 163666501. The next prime is 163666583. The reversal of 163666543 is 345666361.

It is an a-pointer prime, because the next prime (163666583) can be obtained adding 163666543 to its sum of digits (40).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 163666543 - 2¹³ = 163658351 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 163666496 and 163666505.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163666583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81833271 + 81833272.

It is an arithmetic number, because the mean of its divisors is an integer number (81833272).

Almost surely, 2^163666543 is an apocalyptic number.

163666543 is a deficient number, since it is larger than the sum of its proper divisors (1).

163666543 is an equidigital number, since it uses as much as digits as its factorization.

163666543 is an odious number, because the sum of its binary digits is odd.

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

The square root of 163666543 is about 12793.2225416429. Note that the first 3 decimals coincide. The cubic root of 163666543 is about 546.9991310408. Note that the first 3 decimals are identical.

The spelling of 163666543 in words is "one hundred sixty-three million, six hundred sixty-six thousand, five hundred forty-three".