218946537849 has 16 divisors (see below), whose sum is σ = 316860250112. Its totient is φ = 133675411968.

The previous prime is 218946537809. The next prime is 218946537857. The reversal of 218946537849 is 948735649812.

It is a happy number.

It is not a de Polignac number, because 218946537849 - 2²⁷ = 218812320121 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 218946537849.

It is not an unprimeable number, because it can be changed into a prime (218946537809) 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, 22097464 + ... + 22107369.

It is an arithmetic number, because the mean of its divisors is an integer number (19803765632).

Almost surely, 2^218946537849 is an apocalyptic number.

It is an amenable number.

218946537849 is a deficient number, since it is larger than the sum of its proper divisors (97913712263).

218946537849 is a wasteful number, since it uses less digits than its factorization.

218946537849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44204976.

The product of its digits is 104509440, while the sum is 66.

The spelling of 218946537849 in words is "two hundred eighteen billion, nine hundred forty-six million, five hundred thirty-seven thousand, eight hundred forty-nine".