166342543 has 2 divisors, whose sum is σ = 166342544. Its totient is φ = 166342542.

The previous prime is 166342537. The next prime is 166342597. The reversal of 166342543 is 345243661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166342543 - 2⁹ = 166342031 is a prime.

It is a super-2 number, since 2×166342543² = 55339683223413698, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 166342499 and 166342508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166342243) 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 as a sum of consecutive naturals, namely, 83171271 + 83171272.

It is an arithmetic number, because the mean of its divisors is an integer number (83171272).

Almost surely, 2^166342543 is an apocalyptic number.

166342543 is a deficient number, since it is larger than the sum of its proper divisors (1).

166342543 is an equidigital number, since it uses as much as digits as its factorization.

166342543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 34.

The square root of 166342543 is about 12897.3851225743. The cubic root of 166342543 is about 549.9642323848.

The spelling of 166342543 in words is "one hundred sixty-six million, three hundred forty-two thousand, five hundred forty-three".