215555312255244 has 192 divisors, whose sum is σ = 561114777366528. Its totient is φ = 63956932300800.

The previous prime is 215555312255233. The next prime is 215555312255251. The reversal of 215555312255244 is 442552213555512.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3062134512 + ... + 3062204904.

It is an arithmetic number, because the mean of its divisors is an integer number (2922472798784).

Almost surely, 2^{215555312255244} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215555312255244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (280557388683264).

215555312255244 is an abundant number, since it is smaller than the sum of its proper divisors (345559465111284).

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

215555312255244 is a wasteful number, since it uses less digits than its factorization.

215555312255244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72688 (or 72686 counting only the distinct ones).

The product of its digits is 12000000, while the sum is 51.

The spelling of 215555312255244 in words is "two hundred fifteen trillion, five hundred fifty-five billion, three hundred twelve million, two hundred fifty-five thousand, two hundred forty-four".