11500611997 has 8 divisors (see below), whose sum is σ = 13144871936. Its totient is φ = 9856680912.

The previous prime is 11500611953. The next prime is 11500612043. The reversal of 11500611997 is 79911600511.

11500611997 is nontrivially palindromic in base 14.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11500611997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11500611497) 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, 2058 + ... + 151675.

It is an arithmetic number, because the mean of its divisors is an integer number (1643108992).

Almost surely, 2^11500611997 is an apocalyptic number.

It is an amenable number.

11500611997 is a deficient number, since it is larger than the sum of its proper divisors (1644259939).

11500611997 is a wasteful number, since it uses less digits than its factorization.

11500611997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164427.

The product of its (nonzero) digits is 17010, while the sum is 40.

The spelling of 11500611997 in words is "eleven billion, five hundred million, six hundred eleven thousand, nine hundred ninety-seven".