218185503388472 has 32 divisors (see below), whose sum is σ = 410220452769600. Its totient is φ = 108793419525504.

The previous prime is 218185503388439. The next prime is 218185503388513. The reversal of 218185503388472 is 274883305581812.

It is a junction number, because it is equal to n+sod(n) for n = 218185503388399 and 218185503388408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45205718 + ... + 49798874.

It is an arithmetic number, because the mean of its divisors is an integer number (12819389149050).

Almost surely, 2^{218185503388472} is an apocalyptic number.

It is an amenable number.

218185503388472 is a deficient number, since it is larger than the sum of its proper divisors (192034949381128).

218185503388472 is a wasteful number, since it uses less digits than its factorization.

218185503388472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4609455 (or 4609451 counting only the distinct ones).

The product of its (nonzero) digits is 103219200, while the sum is 65.

The spelling of 218185503388472 in words is "two hundred eighteen trillion, one hundred eighty-five billion, five hundred three million, three hundred eighty-eight thousand, four hundred seventy-two".