166390279 has 8 divisors (see below), whose sum is σ = 184226688. Its totient is φ = 149005560.

The previous prime is 166390253. The next prime is 166390307. The reversal of 166390279 is 972093661.

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

It is not a de Polignac number, because 166390279 - 2⁷ = 166390151 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 (166390079) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 112147 + ... + 113620.

It is an arithmetic number, because the mean of its divisors is an integer number (23028336).

Almost surely, 2^166390279 is an apocalyptic number.

166390279 is a deficient number, since it is larger than the sum of its proper divisors (17836409).

166390279 is a wasteful number, since it uses less digits than its factorization.

166390279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225845.

The product of its (nonzero) digits is 122472, while the sum is 43.

The square root of 166390279 is about 12899.2355975073. The cubic root of 166390279 is about 550.0168358483.

The spelling of 166390279 in words is "one hundred sixty-six million, three hundred ninety thousand, two hundred seventy-nine".