10991990992 has 40 divisors (see below), whose sum is σ = 21481215392. Its totient is φ = 5448643200.

The previous prime is 10991990983. The next prime is 10991991029. The reversal of 10991990992 is 29909919901.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 952843 + ... + 964309.

Almost surely, 2^10991990992 is an apocalyptic number.

It is an amenable number.

10991990992 is a deficient number, since it is larger than the sum of its proper divisors (10489224400).

10991990992 is a wasteful number, since it uses less digits than its factorization.

10991990992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11987 (or 11981 counting only the distinct ones).

The product of its (nonzero) digits is 1062882, while the sum is 58.

The spelling of 10991990992 in words is "ten billion, nine hundred ninety-one million, nine hundred ninety thousand, nine hundred ninety-two".