11555116787 has 4 divisors (see below), whose sum is σ = 11953569120. Its totient is φ = 11156664456.

The previous prime is 11555116777. The next prime is 11555116799. The reversal of 11555116787 is 78761155511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78761155511 = 16141 ⋅4879571.

It is a cyclic number.

It is not a de Polignac number, because 11555116787 - 2²⁸ = 11286681331 is a prime.

It is a super-2 number, since 2×11555116787² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11555116747) 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 3 ways as a sum of consecutive naturals, for example, 199226123 + ... + 199226180.

It is an arithmetic number, because the mean of its divisors is an integer number (2988392280).

Almost surely, 2^11555116787 is an apocalyptic number.

11555116787 is a deficient number, since it is larger than the sum of its proper divisors (398452333).

11555116787 is an equidigital number, since it uses as much as digits as its factorization.

11555116787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398452332.

The product of its digits is 294000, while the sum is 47.

The spelling of 11555116787 in words is "eleven billion, five hundred fifty-five million, one hundred sixteen thousand, seven hundred eighty-seven".