6998399616 has 128 divisors (see below), whose sum is σ = 20055974400. Its totient is φ = 2149429248.

The previous prime is 6998399557. The next prime is 6998399657. The reversal of 6998399616 is 6169938996.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Smith number, since the sum of its digits (66) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3977745 + ... + 3979503.

It is an arithmetic number, because the mean of its divisors is an integer number (156687300).

Almost surely, 2^6998399616 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 6998399616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10027987200).

6998399616 is an abundant number, since it is smaller than the sum of its proper divisors (13057574784).

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

6998399616 is a wasteful number, since it uses less digits than its factorization.

6998399616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2586 (or 2574 counting only the distinct ones).

The product of its digits is 34012224, while the sum is 66.

The square root of 6998399616 is about 83656.4379829789. The cubic root of 6998399616 is about 1912.7853895441.

The spelling of 6998399616 in words is "six billion, nine hundred ninety-eight million, three hundred ninety-nine thousand, six hundred sixteen".