6868198638990 has 256 divisors, whose sum is σ = 20835739330560. Its totient is φ = 1617126166656.

The previous prime is 6868198638979. The next prime is 6868198639069. The reversal of 6868198638990 is 998368918686.

It is a happy number.

6868198638990 is a `hidden beast` number, since 6 + 8 + 68 + 1 + 98 + 6 + 389 + 90 = 666.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 6013969 + ... + 7064291.

It is an arithmetic number, because the mean of its divisors is an integer number (81389606760).

Almost surely, 2^{6868198638990} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6868198638990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10417869665280).

6868198638990 is an abundant number, since it is smaller than the sum of its proper divisors (13967540691570).

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

6868198638990 is a wasteful number, since it uses less digits than its factorization.

6868198638990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1050387 (or 1050369 counting only the distinct ones).

The product of its (nonzero) digits is 1934917632, while the sum is 81.

The spelling of 6868198638990 in words is "six trillion, eight hundred sixty-eight billion, one hundred ninety-eight million, six hundred thirty-eight thousand, nine hundred ninety".