6698781759778 has 8 divisors (see below), whose sum is σ = 10051075907100. Its totient is φ = 3348423124080.

The previous prime is 6698781759767. The next prime is 6698781759793. The reversal of 6698781759778 is 8779571878966.

It can be written as a sum of positive squares in 2 ways, for example, as 6568133488569 + 130648271209 = 2562837^2 + 361453^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 483869253 + ... + 483883096.

Almost surely, 2^{6698781759778} is an apocalyptic number.

6698781759778 is a deficient number, since it is larger than the sum of its proper divisors (3352294147322).

6698781759778 is a wasteful number, since it uses less digits than its factorization.

6698781759778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 967755812.

The product of its digits is 17923368960, while the sum is 88.

The spelling of 6698781759778 in words is "six trillion, six hundred ninety-eight billion, seven hundred eighty-one million, seven hundred fifty-nine thousand, seven hundred seventy-eight".