6685361809 has 16 divisors (see below), whose sum is σ = 8092659456. Its totient is φ = 5391360000.

The previous prime is 6685361797. The next prime is 6685361821. The reversal of 6685361809 is 9081635866.

It is an interprime number because it is at equal distance from previous prime (6685361797) and next prime (6685361821).

It is a cyclic number.

It is not a de Polignac number, because 6685361809 - 2⁵ = 6685361777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6685361849) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 409809 + ... + 425809.

It is an arithmetic number, because the mean of its divisors is an integer number (505791216).

Almost surely, 2^6685361809 is an apocalyptic number.

It is an amenable number.

6685361809 is a deficient number, since it is larger than the sum of its proper divisors (1407297647).

6685361809 is a wasteful number, since it uses less digits than its factorization.

6685361809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19536.

The product of its (nonzero) digits is 1866240, while the sum is 52.

The square root of 6685361809 is about 81764.0618425968. The cubic root of 6685361809 is about 1883.8296960696.

The spelling of 6685361809 in words is "six billion, six hundred eighty-five million, three hundred sixty-one thousand, eight hundred nine".