218274975815 has 32 divisors (see below), whose sum is σ = 284816964096. Its totient is φ = 159623890560.

The previous prime is 218274975811. The next prime is 218274975817. The reversal of 218274975815 is 518579472812.

It is a happy number.

It is not a de Polignac number, because 218274975815 - 2² = 218274975811 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218274975811) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34848374 + ... + 34854636.

It is an arithmetic number, because the mean of its divisors is an integer number (8900530128).

Almost surely, 2^218274975815 is an apocalyptic number.

218274975815 is a deficient number, since it is larger than the sum of its proper divisors (66541988281).

218274975815 is a wasteful number, since it uses less digits than its factorization.

218274975815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11399.

The product of its digits is 11289600, while the sum is 59.

The spelling of 218274975815 in words is "two hundred eighteen billion, two hundred seventy-four million, nine hundred seventy-five thousand, eight hundred fifteen".