218828684606509 has 8 divisors (see below), whose sum is σ = 220208515319232. Its totient is φ = 217453003761600.

The previous prime is 218828684606503. The next prime is 218828684606671. The reversal of 218828684606509 is 905606486828812.

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

It is a cyclic number.

It is not a de Polignac number, because 218828684606509 - 2²¹ = 218828682509357 is a prime.

It is a super-2 number, since 2×218828684606509² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218828684606503) 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 7 ways as a sum of consecutive naturals, for example, 1037361159 + ... + 1037572084.

It is an arithmetic number, because the mean of its divisors is an integer number (27526064414904).

Almost surely, 2^{218828684606509} is an apocalyptic number.

It is an amenable number.

218828684606509 is a deficient number, since it is larger than the sum of its proper divisors (1379830712723).

218828684606509 is a wasteful number, since it uses less digits than its factorization.

218828684606509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2074933907.

The product of its (nonzero) digits is 637009920, while the sum is 73.

The spelling of 218828684606509 in words is "two hundred eighteen trillion, eight hundred twenty-eight billion, six hundred eighty-four million, six hundred six thousand, five hundred nine".