166487539 has 2 divisors, whose sum is σ = 166487540. Its totient is φ = 166487538.

The previous prime is 166487537. The next prime is 166487543. The reversal of 166487539 is 935784661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166487539 - 2¹ = 166487537 is a prime.

Together with 166487537, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 166487492 and 166487501.

It is not a weakly prime, because it can be changed into another prime (166487537) 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, 83243769 + 83243770.

It is an arithmetic number, because the mean of its divisors is an integer number (83243770).

Almost surely, 2^166487539 is an apocalyptic number.

166487539 is a deficient number, since it is larger than the sum of its proper divisors (1).

166487539 is an equidigital number, since it uses as much as digits as its factorization.

166487539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1088640, while the sum is 49.

The square root of 166487539 is about 12903.0050375872. The cubic root of 166487539 is about 550.1239819670.

The spelling of 166487539 in words is "one hundred sixty-six million, four hundred eighty-seven thousand, five hundred thirty-nine".