218841959857 has 8 divisors (see below), whose sum is σ = 224188172712. Its totient is φ = 213496156800.

The previous prime is 218841959783. The next prime is 218841959873. The reversal of 218841959857 is 758959148812.

It can be written as a sum of positive squares in 4 ways, for example, as 1010667681 + 217831292176 = 31791^2 + 466724^2 .

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 218841959857 - 2⁷ = 218841959729 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 218841959792 and 218841959801.

It is not an unprimeable number, because it can be changed into a prime (218841959887) 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, 1169007 + ... + 1343227.

It is an arithmetic number, because the mean of its divisors is an integer number (28023521589).

Almost surely, 2^218841959857 is an apocalyptic number.

It is an amenable number.

218841959857 is a deficient number, since it is larger than the sum of its proper divisors (5346212855).

218841959857 is a wasteful number, since it uses less digits than its factorization.

218841959857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204899.

The product of its digits is 58060800, while the sum is 67.

The spelling of 218841959857 in words is "two hundred eighteen billion, eight hundred forty-one million, nine hundred fifty-nine thousand, eight hundred fifty-seven".