166391573 has 8 divisors (see below), whose sum is σ = 167699808. Its totient is φ = 165087664.

The previous prime is 166391567. The next prime is 166391579. The reversal of 166391573 is 375193661.

It is an interprime number because it is at equal distance from previous prime (166391567) and next prime (166391579).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 166391573 - 2⁴ = 166391557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 166391573.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166391579) 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, 142490 + ... + 143652.

It is an arithmetic number, because the mean of its divisors is an integer number (20962476).

Almost surely, 2^166391573 is an apocalyptic number.

It is an amenable number.

166391573 is a deficient number, since it is larger than the sum of its proper divisors (1308235).

166391573 is a wasteful number, since it uses less digits than its factorization.

166391573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2163.

The product of its digits is 102060, while the sum is 41.

The square root of 166391573 is about 12899.2857554207. The cubic root of 166391573 is about 550.0182616526.

The spelling of 166391573 in words is "one hundred sixty-six million, three hundred ninety-one thousand, five hundred seventy-three".