6685378559999 has 16 divisors (see below), whose sum is σ = 6880205629440. Its totient is φ = 6491306495520.

The previous prime is 6685378559929. The next prime is 6685378560053. The reversal of 6685378559999 is 9999558735866.

It is a cyclic number.

It is not a de Polignac number, because 6685378559999 - 2¹⁶ = 6685378494463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6685378559929) 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, 45547322 + ... + 45693864.

It is an arithmetic number, because the mean of its divisors is an integer number (430012851840).

Almost surely, 2^{6685378559999} is an apocalyptic number.

6685378559999 is a deficient number, since it is larger than the sum of its proper divisors (194827069441).

6685378559999 is a wasteful number, since it uses less digits than its factorization.

6685378559999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149110.

The product of its digits is 39680928000, while the sum is 89.

The spelling of 6685378559999 in words is "six trillion, six hundred eighty-five billion, three hundred seventy-eight million, five hundred fifty-nine thousand, nine hundred ninety-nine".