10991242642880 has 56 divisors (see below), whose sum is σ = 26173950204192. Its totient is φ = 4396320064512.

The previous prime is 10991242642873. The next prime is 10991242642889. The reversal of 10991242642880 is 8824624219901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10991242642889) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7418234 + ... + 8775686.

It is an arithmetic number, because the mean of its divisors is an integer number (467391967932).

Almost surely, 2^{10991242642880} is an apocalyptic number.

10991242642880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10991242642880 is an abundant number, since it is smaller than the sum of its proper divisors (15182707561312).

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

10991242642880 is a wasteful number, since it uses less digits than its factorization.

10991242642880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1382773 (or 1382763 counting only the distinct ones).

The product of its (nonzero) digits is 3981312, while the sum is 56.

The spelling of 10991242642880 in words is "ten trillion, nine hundred ninety-one billion, two hundred forty-two million, six hundred forty-two thousand, eight hundred eighty".