10991193406 has 12 divisors (see below), whose sum is σ = 17035780896. Its totient is φ = 5318318460.

The previous prime is 10991193391. The next prime is 10991193427. The reversal of 10991193406 is 60439119901.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2857390 + ... + 2861233.

It is an arithmetic number, because the mean of its divisors is an integer number (1419648408).

Almost surely, 2^10991193406 is an apocalyptic number.

10991193406 is a deficient number, since it is larger than the sum of its proper divisors (6044587490).

10991193406 is an equidigital number, since it uses as much as digits as its factorization.

10991193406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5718687 (or 5718656 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 43.

The spelling of 10991193406 in words is "ten billion, nine hundred ninety-one million, one hundred ninety-three thousand, four hundred six".