166393983 has 32 divisors (see below), whose sum is σ = 269107200. Its totient is φ = 89391456.

The previous prime is 166393939. The next prime is 166393991. The reversal of 166393983 is 389393661.

It is a happy number.

It is not a de Polignac number, because 166393983 - 2⁸ = 166393727 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166393783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25578 + ... + 31416.

It is an arithmetic number, because the mean of its divisors is an integer number (8409600).

Almost surely, 2^166393983 is an apocalyptic number.

166393983 is a deficient number, since it is larger than the sum of its proper divisors (102713217).

166393983 is a wasteful number, since it uses less digits than its factorization.

166393983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5931.

The product of its digits is 629856, while the sum is 48.

The square root of 166393983 is about 12899.3791711074. The cubic root of 166393983 is about 550.0209171108.

The spelling of 166393983 in words is "one hundred sixty-six million, three hundred ninety-three thousand, nine hundred eighty-three".