11811990993 has 8 divisors (see below), whose sum is σ = 17181077856. Its totient is φ = 7158782400.

The previous prime is 11811990989. The next prime is 11811991001. The reversal of 11811990993 is 39909911811.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11811990993 - 2² = 11811990989 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11811990293) 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, 178969528 + ... + 178969593.

It is an arithmetic number, because the mean of its divisors is an integer number (2147634732).

Almost surely, 2^11811990993 is an apocalyptic number.

It is an amenable number.

11811990993 is a deficient number, since it is larger than the sum of its proper divisors (5369086863).

11811990993 is a wasteful number, since it uses less digits than its factorization.

11811990993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357939135.

The product of its (nonzero) digits is 157464, while the sum is 51.

The spelling of 11811990993 in words is "eleven billion, eight hundred eleven million, nine hundred ninety thousand, nine hundred ninety-three".