166685147 has 4 divisors (see below), whose sum is σ = 167475336. Its totient is φ = 165894960.

The previous prime is 166685143. The next prime is 166685177. The reversal of 166685147 is 741586661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 741586661 = 3109 ⋅238529.

It is a cyclic number.

It is not a de Polignac number, because 166685147 - 2² = 166685143 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166685098 and 166685107.

It is not an unprimeable number, because it can be changed into a prime (166685143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 394778 + ... + 395199.

It is an arithmetic number, because the mean of its divisors is an integer number (41868834).

Almost surely, 2^166685147 is an apocalyptic number.

166685147 is a deficient number, since it is larger than the sum of its proper divisors (790189).

166685147 is an equidigital number, since it uses as much as digits as its factorization.

166685147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 790188.

The product of its digits is 241920, while the sum is 44.

The square root of 166685147 is about 12910.6602077508. The cubic root of 166685147 is about 550.3415476361.

The spelling of 166685147 in words is "one hundred sixty-six million, six hundred eighty-five thousand, one hundred forty-seven".