218844696549 has 16 divisors (see below), whose sum is σ = 294333581312. Its totient is φ = 144628037568.

The previous prime is 218844696529. The next prime is 218844696559. The reversal of 218844696549 is 945696448812.

It is a happy number.

It is not a de Polignac number, because 218844696549 - 2⁵ = 218844696517 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 218844696549.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218844696529) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 225387 + ... + 698919.

It is an arithmetic number, because the mean of its divisors is an integer number (18395848832).

Almost surely, 2^218844696549 is an apocalyptic number.

It is an amenable number.

218844696549 is a deficient number, since it is larger than the sum of its proper divisors (75488884763).

218844696549 is a wasteful number, since it uses less digits than its factorization.

218844696549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474876.

The product of its digits is 119439360, while the sum is 66.

The spelling of 218844696549 in words is "two hundred eighteen billion, eight hundred forty-four million, six hundred ninety-six thousand, five hundred forty-nine".