6689946816 has 560 divisors, whose sum is σ = 24705218560. Its totient is φ = 1746800640.

The previous prime is 6689946803. The next prime is 6689946829. The reversal of 6689946816 is 6186499866.

It is an interprime number because it is at equal distance from previous prime (6689946803) and next prime (6689946829).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 21373476 + ... + 21373788.

Almost surely, 2^6689946816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6689946816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12352609280).

6689946816 is an abundant number, since it is smaller than the sum of its proper divisors (18015271744).

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

6689946816 is a wasteful number, since it uses less digits than its factorization.

6689946816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394 (or 375 counting only the distinct ones).

The product of its digits is 26873856, while the sum is 63.

The square root of 6689946816 is about 81792.0950703673. The cubic root of 6689946816 is about 1884.2602585811.

The spelling of 6689946816 in words is "six billion, six hundred eighty-nine million, nine hundred forty-six thousand, eight hundred sixteen".