6698778966 has 48 divisors (see below), whose sum is σ = 16666827840. Its totient is φ = 1923093360.

The previous prime is 6698778959. The next prime is 6698778971.

6698778966 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 6698778894 and 6698778903.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 886560 + ... + 894083.

It is an arithmetic number, because the mean of its divisors is an integer number (347225580).

Almost surely, 2^6698778966 is an apocalyptic number.

6698778966 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

6698778966 is an abundant number, since it is smaller than the sum of its proper divisors (9968048874).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6698778966 is a wasteful number, since it uses less digits than its factorization.

6698778966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1780681 (or 1780678 counting only the distinct ones).

The product of its digits is 329204736, while the sum is 72.

The square root of 6698778966 is about 81846.0687266041. The cubic root of 6698778966 is about 1885.0891017881.

The spelling of 6698778966 in words is "six billion, six hundred ninety-eight million, seven hundred seventy-eight thousand, nine hundred sixty-six".