11985791751 has 32 divisors (see below), whose sum is σ = 17916641280. Its totient is φ = 7918712928.

The previous prime is 11985791737. The next prime is 11985791771. The reversal of 11985791751 is 15719758911.

11985791751 is a `hidden beast` number, since 1 + 1 + 9 + 8 + 579 + 17 + 51 = 666.

It is not a de Polignac number, because 11985791751 - 2⁶ = 11985791687 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11985791771) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4686165 + ... + 4688721.

It is an arithmetic number, because the mean of its divisors is an integer number (559895040).

Almost surely, 2^11985791751 is an apocalyptic number.

11985791751 is a deficient number, since it is larger than the sum of its proper divisors (5930849529).

11985791751 is a wasteful number, since it uses less digits than its factorization.

11985791751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4060 (or 4054 counting only the distinct ones).

The product of its digits is 793800, while the sum is 54.

The spelling of 11985791751 in words is "eleven billion, nine hundred eighty-five million, seven hundred ninety-one thousand, seven hundred fifty-one".