11556451791 has 16 divisors (see below), whose sum is σ = 17484940800. Its totient is φ = 7540379064.

The previous prime is 11556451787. The next prime is 11556451793. The reversal of 11556451791 is 19715465511.

11556451791 is a `hidden beast` number, since 1 + 1 + 556 + 4 + 5 + 1 + 7 + 91 = 666.

It is not a de Polignac number, because 11556451791 - 2² = 11556451787 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11556451793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4552101 + ... + 4554638.

It is an arithmetic number, because the mean of its divisors is an integer number (1092808800).

Almost surely, 2^11556451791 is an apocalyptic number.

11556451791 is a deficient number, since it is larger than the sum of its proper divisors (5928489009).

11556451791 is an equidigital number, since it uses as much as digits as its factorization.

11556451791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9106795 (or 9106789 counting only the distinct ones).

The product of its digits is 189000, while the sum is 45.

The spelling of 11556451791 in words is "eleven billion, five hundred fifty-six million, four hundred fifty-one thousand, seven hundred ninety-one".