6688778875 has 16 divisors (see below), whose sum is σ = 8505106272. Its totient is φ = 5250055200.

The previous prime is 6688778861. The next prime is 6688778897. The reversal of 6688778875 is 5788778866.

It is a de Polignac number, because none of the positive numbers 2^k-6688778875 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 498189 + ... + 511438.

It is an arithmetic number, because the mean of its divisors is an integer number (531569142).

Almost surely, 2^6688778875 is an apocalyptic number.

6688778875 is a deficient number, since it is larger than the sum of its proper divisors (1816327397).

6688778875 is a wasteful number, since it uses less digits than its factorization.

6688778875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1009695 (or 1009685 counting only the distinct ones).

The product of its digits is 252887040, while the sum is 70.

The square root of 6688778875 is about 81784.9550650974. The cubic root of 6688778875 is about 1884.1505998673.

Subtracting from 6688778875 its reverse (5788778866), we obtain a palindrome (900000009).

The spelling of 6688778875 in words is "six billion, six hundred eighty-eight million, seven hundred seventy-eight thousand, eight hundred seventy-five".