216655115720 has 64 divisors (see below), whose sum is σ = 509075280000. Its totient is φ = 82827847168.

The previous prime is 216655115689. The next prime is 216655115723. The reversal of 216655115720 is 27511556612.

216655115720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×216655115720² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (216655115723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1064756 + ... + 1251804.

It is an arithmetic number, because the mean of its divisors is an integer number (7954301250).

Almost surely, 2^216655115720 is an apocalyptic number.

216655115720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216655115720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (254537640000).

216655115720 is an abundant number, since it is smaller than the sum of its proper divisors (292420164280).

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

216655115720 is a wasteful number, since it uses less digits than its factorization.

216655115720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188342 (or 188338 counting only the distinct ones).

The product of its (nonzero) digits is 126000, while the sum is 41.

The spelling of 216655115720 in words is "two hundred sixteen billion, six hundred fifty-five million, one hundred fifteen thousand, seven hundred twenty".