218917308996 has 81 divisors (see below), whose sum is σ = 573327389271. Its totient is φ = 70429943808.

The previous prime is 218917308959. The next prime is 218917309043. The reversal of 218917308996 is 699803719812.

The square root of 218917308996 is 467886.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 63712827396 + 155204481600 = 252414^2 + 393960^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 81410820 + ... + 81413508.

Almost surely, 2^218917308996 is an apocalyptic number.

218917308996 is the 467886-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 218917308996

218917308996 is an abundant number, since it is smaller than the sum of its proper divisors (354410080275).

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

218917308996 is an equidigital number, since it uses as much as digits as its factorization.

218917308996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5446 (or 2723 counting only the distinct ones).

The product of its (nonzero) digits is 11757312, while the sum is 63.

The spelling of 218917308996 in words is "two hundred eighteen billion, nine hundred seventeen million, three hundred eight thousand, nine hundred ninety-six".