216534415650 has 192 divisors, whose sum is σ = 642979799040. Its totient is φ = 47181657600.

The previous prime is 216534415649. The next prime is 216534415661. The reversal of 216534415650 is 56514435612.

216534415650 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is an unprimeable number.

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 95 ways as a sum of consecutive naturals, for example, 2131206 + ... + 2230494.

It is an arithmetic number, because the mean of its divisors is an integer number (3348853120).

Almost surely, 2^216534415650 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216534415650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (321489899520).

216534415650 is an abundant number, since it is smaller than the sum of its proper divisors (426445383390).

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

216534415650 is a wasteful number, since it uses less digits than its factorization.

216534415650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99409 (or 99404 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 42.

The spelling of 216534415650 in words is "two hundred sixteen billion, five hundred thirty-four million, four hundred fifteen thousand, six hundred fifty".