166438065 has 16 divisors (see below), whose sum is σ = 272797056. Its totient is φ = 86601600.

The previous prime is 166438049. The next prime is 166438087. The reversal of 166438065 is 560834661.

It is not a de Polignac number, because 166438065 - 2⁴ = 166438049 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 134701 + ... + 135930.

It is an arithmetic number, because the mean of its divisors is an integer number (17049816).

Almost surely, 2^166438065 is an apocalyptic number.

166438065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

166438065 is a deficient number, since it is larger than the sum of its proper divisors (106358991).

166438065 is a wasteful number, since it uses less digits than its factorization.

166438065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270680.

The product of its (nonzero) digits is 103680, while the sum is 39.

The square root of 166438065 is about 12901.0877448376. The cubic root of 166438065 is about 550.0694843343.

The spelling of 166438065 in words is "one hundred sixty-six million, four hundred thirty-eight thousand, sixty-five".