218702531380 has 12 divisors (see below), whose sum is σ = 459275315940. Its totient is φ = 87481012544.

The previous prime is 218702531293. The next prime is 218702531407. The reversal of 218702531380 is 83135207812.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 93395027236 + 125307504144 = 305606^2 + 353988^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5467563265 + ... + 5467563304.

It is an arithmetic number, because the mean of its divisors is an integer number (38272942995).

Almost surely, 2^218702531380 is an apocalyptic number.

218702531380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

218702531380 is an abundant number, since it is smaller than the sum of its proper divisors (240572784560).

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

218702531380 is a wasteful number, since it uses less digits than its factorization.

218702531380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10935126578 (or 10935126576 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 40.

The spelling of 218702531380 in words is "two hundred eighteen billion, seven hundred two million, five hundred thirty-one thousand, three hundred eighty".