218516854100 has 18 divisors (see below), whose sum is σ = 474181573614. Its totient is φ = 87406741600.

The previous prime is 218516854067. The next prime is 218516854103. The reversal of 218516854100 is 1458615812.

It can be written as a sum of positive squares in 3 ways, for example, as 15040079044 + 203476775056 = 122638^2 + 451084^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218516854103) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1092584171 + ... + 1092584370.

Almost surely, 2^218516854100 is an apocalyptic number.

218516854100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

218516854100 is an abundant number, since it is smaller than the sum of its proper divisors (255664719514).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

218516854100 is a wasteful number, since it uses less digits than its factorization.

218516854100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2185168555 (or 2185168548 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 41.

The spelling of 218516854100 in words is "two hundred eighteen billion, five hundred sixteen million, eight hundred fifty-four thousand, one hundred".