218338646477 has 8 divisors (see below), whose sum is σ = 252000475392. Its totient is φ = 185294466000.

The previous prime is 218338646429. The next prime is 218338646527. The reversal of 218338646477 is 774646833812.

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

It is not a de Polignac number, because 218338646477 - 2⁸ = 218338646221 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 (218338646177) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 154411349 + ... + 154412762.

It is an arithmetic number, because the mean of its divisors is an integer number (31500059424).

Almost surely, 2^218338646477 is an apocalyptic number.

It is an amenable number.

218338646477 is a deficient number, since it is larger than the sum of its proper divisors (33661828915).

218338646477 is a wasteful number, since it uses less digits than its factorization.

218338646477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308824219.

The product of its digits is 32514048, while the sum is 59.

The spelling of 218338646477 in words is "two hundred eighteen billion, three hundred thirty-eight million, six hundred forty-six thousand, four hundred seventy-seven".