166995583 has 8 divisors (see below), whose sum is σ = 171241056. Its totient is φ = 162855280.

The previous prime is 166995533. The next prime is 166995589. The reversal of 166995583 is 385599661.

It is not a de Polignac number, because 166995583 - 2⁹ = 166995071 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166995583.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166995589) 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 7 ways as a sum of consecutive naturals, for example, 67710 + ... + 70132.

It is an arithmetic number, because the mean of its divisors is an integer number (21405132).

Almost surely, 2^166995583 is an apocalyptic number.

166995583 is a deficient number, since it is larger than the sum of its proper divisors (4245473).

166995583 is an frugal number, since it uses more digits than its factorization.

166995583 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2546 (or 2464 counting only the distinct ones).

The product of its digits is 1749600, while the sum is 52.

The square root of 166995583 is about 12922.6770833291. The cubic root of 166995583 is about 550.6829895296.

The spelling of 166995583 in words is "one hundred sixty-six million, nine hundred ninety-five thousand, five hundred eighty-three".