218432270008681 has 4 divisors (see below), whose sum is σ = 219338627975764. Its totient is φ = 217525912041600.

The previous prime is 218432270008679. The next prime is 218432270008697. The reversal of 218432270008681 is 186800072234812.

218432270008681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 117284676338025 + 101147593670656 = 10829805^2 + 10057216^2 .

It is a cyclic number.

It is not a de Polignac number, because 218432270008681 - 2¹ = 218432270008679 is a prime.

It is a super-2 number, since 2×218432270008681² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218432270008081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 453178983180 + ... + 453178983661.

It is an arithmetic number, because the mean of its divisors is an integer number (54834656993941).

Almost surely, 2^{218432270008681} is an apocalyptic number.

It is an amenable number.

218432270008681 is a deficient number, since it is larger than the sum of its proper divisors (906357967083).

218432270008681 is an equidigital number, since it uses as much as digits as its factorization.

218432270008681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 906357967082.

The product of its (nonzero) digits is 2064384, while the sum is 52.

The spelling of 218432270008681 in words is "two hundred eighteen trillion, four hundred thirty-two billion, two hundred seventy million, eight thousand, six hundred eighty-one".