218415517394 has 8 divisors (see below), whose sum is σ = 333804847500. Its totient is φ = 107147234896.

The previous prime is 218415517373. The next prime is 218415517399. The reversal of 218415517394 is 493715514812.

218415517394 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 204263322025 + 14152195369 = 451955^2 + 118963^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (218415517399) 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, 1030261769 + ... + 1030261980.

Almost surely, 2^218415517394 is an apocalyptic number.

218415517394 is a deficient number, since it is larger than the sum of its proper divisors (115389330106).

218415517394 is a wasteful number, since it uses less digits than its factorization.

218415517394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2060523804.

The product of its digits is 1209600, while the sum is 50.

The spelling of 218415517394 in words is "two hundred eighteen billion, four hundred fifteen million, five hundred seventeen thousand, three hundred ninety-four".