991080068682 has 128 divisors (see below), whose sum is σ = 2332795852800. Its totient is φ = 277448371200.

The previous prime is 991080068669. The next prime is 991080068717. The reversal of 991080068682 is 286860080199.

It is a Harshad number since it is a multiple of its sum of digits (57).

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, 164984523 + ... + 164990529.

It is an arithmetic number, because the mean of its divisors is an integer number (18224967600).

Almost surely, 2^991080068682 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 991080068682, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1166397926400).

991080068682 is an abundant number, since it is smaller than the sum of its proper divisors (1341715784118).

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

991080068682 is a wasteful number, since it uses less digits than its factorization.

991080068682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9292.

The product of its (nonzero) digits is 2985984, while the sum is 57.

The spelling of 991080068682 in words is "nine hundred ninety-one billion, eighty million, sixty-eight thousand, six hundred eighty-two".