218756320117 has 8 divisors (see below), whose sum is σ = 219304272096. Its totient is φ = 218208708912.

The previous prime is 218756320067. The next prime is 218756320187. The reversal of 218756320117 is 711023657812.

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

It is not a de Polignac number, because 218756320117 - 2¹⁹ = 218755795829 is a prime.

It is a super-2 number, since 2×218756320117² (a number of 23 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 (218756320187) 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, 1225443 + ... + 1392559.

It is an arithmetic number, because the mean of its divisors is an integer number (27413034012).

Almost surely, 2^218756320117 is an apocalyptic number.

It is an amenable number.

218756320117 is a deficient number, since it is larger than the sum of its proper divisors (547951979).

218756320117 is a wasteful number, since it uses less digits than its factorization.

218756320117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170387.

The product of its (nonzero) digits is 141120, while the sum is 43.

Adding to 218756320117 its reverse (711023657812), we get a palindrome (929779977929).

The spelling of 218756320117 in words is "two hundred eighteen billion, seven hundred fifty-six million, three hundred twenty thousand, one hundred seventeen".