218205861803 has 4 divisors (see below), whose sum is σ = 218702914320. Its totient is φ = 217708809288.

The previous prime is 218205861791. The next prime is 218205861833. The reversal of 218205861803 is 308168502812.

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

It is a cyclic number.

It is not a de Polignac number, because 218205861803 - 2²⁴ = 218189084587 is a prime.

It is a super-2 number, since 2×218205861803² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218205861833) 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, 248525600 + ... + 248526477.

It is an arithmetic number, because the mean of its divisors is an integer number (54675728580).

Almost surely, 2^218205861803 is an apocalyptic number.

218205861803 is a deficient number, since it is larger than the sum of its proper divisors (497052517).

218205861803 is an equidigital number, since it uses as much as digits as its factorization.

218205861803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 497052516.

The product of its (nonzero) digits is 184320, while the sum is 44.

The spelling of 218205861803 in words is "two hundred eighteen billion, two hundred five million, eight hundred sixty-one thousand, eight hundred three".