220166685 has 24 divisors (see below), whose sum is σ = 382486104. Its totient is φ = 117156480.

The previous prime is 220166671. The next prime is 220166689. The reversal of 220166685 is 586661022.

It can be written as a sum of positive squares in 4 ways, for example, as 70862724 + 149303961 = 8418^2 + 12219^2 .

It is not a de Polignac number, because 220166685 - 2¹⁵ = 220133917 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220166689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15439 + ... + 26051.

It is an arithmetic number, because the mean of its divisors is an integer number (15936921).

Almost surely, 2^220166685 is an apocalyptic number.

It is an amenable number.

220166685 is a deficient number, since it is larger than the sum of its proper divisors (162319419).

220166685 is a wasteful number, since it uses less digits than its factorization.

220166685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11085 (or 11082 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 220166685 is about 14838.0148604859. The cubic root of 220166685 is about 603.8334966759.

It can be divided in two parts, 2201 and 66685, that added together give a palindrome (68886).

The spelling of 220166685 in words is "two hundred twenty million, one hundred sixty-six thousand, six hundred eighty-five".