11728427078818 has 4 divisors (see below), whose sum is σ = 17592640618230. Its totient is φ = 5864213539408.

The previous prime is 11728427078803. The next prime is 11728427078839. The reversal of 11728427078818 is 81887072482711.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 7012767274569 + 4715659804249 = 2648163^2 + 2171557^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 11728427078818.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2932106769703 + ... + 2932106769706.

Almost surely, 2^{11728427078818} is an apocalyptic number.

11728427078818 is a deficient number, since it is larger than the sum of its proper divisors (5864213539412).

11728427078818 is an equidigital number, since it uses as much as digits as its factorization.

11728427078818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5864213539411.

The product of its (nonzero) digits is 22478848, while the sum is 64.

The spelling of 11728427078818 in words is "eleven trillion, seven hundred twenty-eight billion, four hundred twenty-seven million, seventy-eight thousand, eight hundred eighteen".