215756918108 has 12 divisors (see below), whose sum is σ = 377860874160. Its totient is φ = 107796668352.

The previous prime is 215756918107. The next prime is 215756918119. The reversal of 215756918108 is 801819657512.

215756918108 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 2×215756918108² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 215756918108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215756918107) 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 3 ways as a sum of consecutive naturals, for example, 20441741 + ... + 20452292.

It is an arithmetic number, because the mean of its divisors is an integer number (31488406180).

Almost surely, 2^215756918108 is an apocalyptic number.

It is an amenable number.

215756918108 is a deficient number, since it is larger than the sum of its proper divisors (162103956052).

215756918108 is a wasteful number, since it uses less digits than its factorization.

215756918108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40895356 (or 40895354 counting only the distinct ones).

The product of its (nonzero) digits is 1209600, while the sum is 53.

The spelling of 215756918108 in words is "two hundred fifteen billion, seven hundred fifty-six million, nine hundred eighteen thousand, one hundred eight".