6685188169 has 9 divisors (see below), whose sum is σ = 7349170759. Its totient is φ = 6076626160.

The previous prime is 6685188163. The next prime is 6685188193. The reversal of 6685188169 is 9618815866.

The square root of 6685188169 is 81763.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 398601225 + 6286586944 = 19965^2 + 79288^2 .

It is not a de Polignac number, because 6685188169 - 2⁹ = 6685187657 is a prime.

It is a super-2 number, since 2×6685188169² = 89383481709875145122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6685188163) 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 8 ways as a sum of consecutive naturals, for example, 895677 + ... + 903109.

Almost surely, 2^6685188169 is an apocalyptic number.

6685188169 is the 81763-rd square number.

6685188169 is the 40882-nd centered octagonal number.

It is an amenable number.

6685188169 is a deficient number, since it is larger than the sum of its proper divisors (663982590).

6685188169 is an frugal number, since it uses more digits than its factorization.

6685188169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14888 (or 7444 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 58.

The cubic root of 6685188169 is about 1883.8133862557.

The spelling of 6685188169 in words is "six billion, six hundred eighty-five million, one hundred eighty-eight thousand, one hundred sixty-nine".