6999658659840 has 2176 divisors, whose sum is σ = 30536984494080. Its totient is φ = 1324980633600.

The previous prime is 6999658659811. The next prime is 6999658659883. The reversal of 6999658659840 is 489568569996.

It is a Harshad number since it is a multiple of its sum of digits (84).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 44583813042 + ... + 44583813198.

Almost surely, 2^{6999658659840} is an apocalyptic number.

6999658659840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6999658659840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15268492247040).

6999658659840 is an abundant number, since it is smaller than the sum of its proper divisors (23537325834240).

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

6999658659840 is a wasteful number, since it uses less digits than its factorization.

6999658659840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265 (or 235 counting only the distinct ones).

The product of its (nonzero) digits is 9069926400, while the sum is 84.

The spelling of 6999658659840 in words is "six trillion, nine hundred ninety-nine billion, six hundred fifty-eight million, six hundred fifty-nine thousand, eight hundred forty".