166539266 has 4 divisors (see below), whose sum is σ = 249808902. Its totient is φ = 83269632.

The previous prime is 166539229. The next prime is 166539271. The reversal of 166539266 is 662935661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 662935661 = 641 ⋅1034221.

It can be written as a sum of positive squares in only one way, i.e., 109098025 + 57441241 = 10445^2 + 7579^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41634815 + ... + 41634818.

Almost surely, 2^166539266 is an apocalyptic number.

166539266 is a deficient number, since it is larger than the sum of its proper divisors (83269636).

166539266 is an equidigital number, since it uses as much as digits as its factorization.

166539266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83269635.

The product of its digits is 349920, while the sum is 44.

The square root of 166539266 is about 12905.0093374627. The cubic root of 166539266 is about 550.1809498274.

The spelling of 166539266 in words is "one hundred sixty-six million, five hundred thirty-nine thousand, two hundred sixty-six".