6685775865 has 48 divisors (see below), whose sum is σ = 12103790400. Its totient is φ = 3410522496.

The previous prime is 6685775843. The next prime is 6685775869. The reversal of 6685775865 is 5685775866.

It is a happy number.

6685775865 is a `hidden beast` number, since 6 + 6 + 8 + 577 + 58 + 6 + 5 = 666.

It is not a de Polignac number, because 6685775865 - 2⁶ = 6685775801 is a prime.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6685775869) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 64206 + ... + 132264.

It is an arithmetic number, because the mean of its divisors is an integer number (252162300).

Almost surely, 2^6685775865 is an apocalyptic number.

It is an amenable number.

6685775865 is a deficient number, since it is larger than the sum of its proper divisors (5418014535).

6685775865 is a wasteful number, since it uses less digits than its factorization.

6685775865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68166 (or 68163 counting only the distinct ones).

The product of its digits is 84672000, while the sum is 63.

The square root of 6685775865 is about 81766.5938204595. The cubic root of 6685775865 is about 1883.8685867539.

Subtracting from 6685775865 its reverse (5685775866), we obtain a palindrome (999999999).

The spelling of 6685775865 in words is "six billion, six hundred eighty-five million, seven hundred seventy-five thousand, eight hundred sixty-five".