10991322960 has 80 divisors (see below), whose sum is σ = 34083175680. Its totient is φ = 2930152960.

The previous prime is 10991322949. The next prime is 10991323001. The reversal of 10991322960 is 6922319901.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-3 number, since 3×10991322960³ (a number of 31 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1575961 + ... + 1582919.

It is an arithmetic number, because the mean of its divisors is an integer number (426039696).

Almost surely, 2^10991322960 is an apocalyptic number.

10991322960 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10991322960 is an abundant number, since it is smaller than the sum of its proper divisors (23091852720).

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

10991322960 is a wasteful number, since it uses less digits than its factorization.

10991322960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13556 (or 13550 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 42.

The spelling of 10991322960 in words is "ten billion, nine hundred ninety-one million, three hundred twenty-two thousand, nine hundred sixty".