68991539496 has 128 divisors (see below), whose sum is σ = 196701696000. Its totient is φ = 19960666880.

The previous prime is 68991539479. The next prime is 68991539503. The reversal of 68991539496 is 69493519986.

It is a Harshad number since it is a multiple of its sum of digits (69).

It is a self number, because there is not a number n which added to its sum of digits gives 68991539496.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3371905 + ... + 3392303.

It is an arithmetic number, because the mean of its divisors is an integer number (1536732000).

Almost surely, 2^68991539496 is an apocalyptic number.

68991539496 is a gapful number since it is divisible by the number (66) 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 68991539496, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98350848000).

68991539496 is an abundant number, since it is smaller than the sum of its proper divisors (127710156504).

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

68991539496 is a wasteful number, since it uses less digits than its factorization.

68991539496 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20999 (or 20995 counting only the distinct ones).

The product of its digits is 113374080, while the sum is 69.

The spelling of 68991539496 in words is "sixty-eight billion, nine hundred ninety-one million, five hundred thirty-nine thousand, four hundred ninety-six".