11668728787 has 16 divisors (see below), whose sum is σ = 12527723520. Its totient is φ = 10829814912.

The previous prime is 11668728769. The next prime is 11668728833. The reversal of 11668728787 is 78782786611.

It is not a de Polignac number, because 11668728787 - 2¹¹ = 11668726739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11668728707) 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, 404548 + ... + 432430.

It is an arithmetic number, because the mean of its divisors is an integer number (782982720).

Almost surely, 2^11668728787 is an apocalyptic number.

11668728787 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

11668728787 is a deficient number, since it is larger than the sum of its proper divisors (858994733).

11668728787 is a wasteful number, since it uses less digits than its factorization.

11668728787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28242.

The product of its digits is 12644352, while the sum is 61.

The spelling of 11668728787 in words is "eleven billion, six hundred sixty-eight million, seven hundred twenty-eight thousand, seven hundred eighty-seven".