166539026 has 8 divisors (see below), whose sum is σ = 250356540. Its totient is φ = 83086848.

The previous prime is 166539017. The next prime is 166539041. The reversal of 166539026 is 620935661.

It is a Cunningham number, because it is equal to 12905²+1.

It can be written as a sum of positive squares in 2 ways, for example, as 166539025 + 1 = 12905^2 + 1^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90191 + ... + 92018.

Almost surely, 2^166539026 is an apocalyptic number.

166539026 is a deficient number, since it is larger than the sum of its proper divisors (83817514).

166539026 is a wasteful number, since it uses less digits than its factorization.

166539026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182668.

The product of its (nonzero) digits is 58320, while the sum is 38.

The square root of 166539026 is about 12905.0000387447. Note that the first 4 decimals coincide. The cubic root of 166539026 is about 550.1806855384.

The spelling of 166539026 in words is "one hundred sixty-six million, five hundred thirty-nine thousand, twenty-six".