166255785 has 12 divisors (see below), whose sum is σ = 288176772. Its totient is φ = 88669728.

The previous prime is 166255783. The next prime is 166255807. The reversal of 166255785 is 587552661.

166255785 is a `hidden beast` number, since 16 + 6 + 2 + 557 + 85 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 94887081 + 71368704 = 9741^2 + 8448^2 .

It is not a de Polignac number, because 166255785 - 2¹ = 166255783 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 3694573 = 166255785 / (1 + 6 + 6 + 2 + 5 + 5 + 7 + 8 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 166255785.

It is not an unprimeable number, because it can be changed into a prime (166255783) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1847242 + ... + 1847331.

It is an arithmetic number, because the mean of its divisors is an integer number (24014731).

Almost surely, 2^166255785 is an apocalyptic number.

166255785 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

166255785 is a deficient number, since it is larger than the sum of its proper divisors (121920987).

166255785 is a wasteful number, since it uses less digits than its factorization.

166255785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3694584 (or 3694581 counting only the distinct ones).

The product of its digits is 504000, while the sum is 45.

The square root of 166255785 is about 12894.0212889540. The cubic root of 166255785 is about 549.8686022197.

The spelling of 166255785 in words is "one hundred sixty-six million, two hundred fifty-five thousand, seven hundred eighty-five".