6999919668 has 192 divisors, whose sum is σ = 21652323840. Its totient is φ = 1913932800.

The previous prime is 6999919649. The next prime is 6999919673. The reversal of 6999919668 is 8669199996.

It is a junction number, because it is equal to n+sod(n) for n = 6999919596 and 6999919605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1640658 + ... + 1644918.

It is an arithmetic number, because the mean of its divisors is an integer number (112772520).

Almost surely, 2^6999919668 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 6999919668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10826161920).

6999919668 is an abundant number, since it is smaller than the sum of its proper divisors (14652404172).

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

6999919668 is a wasteful number, since it uses less digits than its factorization.

6999919668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4375 (or 4367 counting only the distinct ones).

The product of its digits is 102036672, while the sum is 72.

The square root of 6999919668 is about 83665.5225765070. The cubic root of 6999919668 is about 1912.9238651450.

The spelling of 6999919668 in words is "six billion, nine hundred ninety-nine million, nine hundred nineteen thousand, six hundred sixty-eight".