1218489727385 has 16 divisors (see below), whose sum is σ = 1678565231616. Its totient is φ = 831789010368.

The previous prime is 1218489727333. The next prime is 1218489727421. The reversal of 1218489727385 is 5837279848121.

It is a cyclic number.

It is not a de Polignac number, because 1218489727385 - 2²⁰ = 1218488678809 is a prime.

It is a Curzon number.

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 in 15 ways as a sum of consecutive naturals, for example, 78050474 + ... + 78066083.

It is an arithmetic number, because the mean of its divisors is an integer number (104910326976).

Almost surely, 2^{1218489727385} is an apocalyptic number.

It is an amenable number.

1218489727385 is a deficient number, since it is larger than the sum of its proper divisors (460075504231).

1218489727385 is a wasteful number, since it uses less digits than its factorization.

1218489727385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156116792.

The product of its digits is 54190080, while the sum is 65.

The spelling of 1218489727385 in words is "one trillion, two hundred eighteen billion, four hundred eighty-nine million, seven hundred twenty-seven thousand, three hundred eighty-five".