166804093 has 4 divisors (see below), whose sum is σ = 166830588. Its totient is φ = 166777600.

The previous prime is 166804061. The next prime is 166804133. The reversal of 166804093 is 390408661.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 390408661 = 919 ⋅424819.

It can be written as a sum of positive squares in 2 ways, for example, as 162486009 + 4318084 = 12747^2 + 2078^2 .

It is a cyclic number.

It is not a de Polignac number, because 166804093 - 2⁵ = 166804061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166802093) 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 3 ways as a sum of consecutive naturals, for example, 2205 + ... + 18397.

It is an arithmetic number, because the mean of its divisors is an integer number (41707647).

Almost surely, 2^166804093 is an apocalyptic number.

166804093 is the 6904-th centered heptagonal number.

It is an amenable number.

166804093 is a deficient number, since it is larger than the sum of its proper divisors (26495).

166804093 is a wasteful number, since it uses less digits than its factorization.

166804093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26494.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 166804093 is about 12915.2658896362. The cubic root of 166804093 is about 550.4724238463.

The spelling of 166804093 in words is "one hundred sixty-six million, eight hundred four thousand, ninety-three".