218143772715 has 32 divisors (see below), whose sum is σ = 380833767936. Its totient is φ = 105746197760.

The previous prime is 218143772701. The next prime is 218143772719. The reversal of 218143772715 is 517277341812.

It is not a de Polignac number, because 218143772715 - 2¹⁴ = 218143756331 is a prime.

It is not an unprimeable number, because it can be changed into a prime (218143772719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 744682 + ... + 995408.

It is an arithmetic number, because the mean of its divisors is an integer number (11901055248).

Almost surely, 2^218143772715 is an apocalyptic number.

218143772715 is a deficient number, since it is larger than the sum of its proper divisors (162689995221).

218143772715 is a wasteful number, since it uses less digits than its factorization.

218143772715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256019.

The product of its digits is 658560, while the sum is 48.

The spelling of 218143772715 in words is "two hundred eighteen billion, one hundred forty-three million, seven hundred seventy-two thousand, seven hundred fifteen".