216215515650 has 96 divisors (see below), whose sum is σ = 545854580928. Its totient is φ = 56623852800.

The previous prime is 216215515609. The next prime is 216215515651. The reversal of 216215515650 is 56515512612.

It is a junction number, because it is equal to n+sod(n) for n = 216215515599 and 216215515608.

It is not an unprimeable number, because it can be changed into a prime (216215515651) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5956857 + ... + 5993043.

It is an arithmetic number, because the mean of its divisors is an integer number (5685985218).

Almost surely, 2^216215515650 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216215515650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (272927290464).

216215515650 is an abundant number, since it is smaller than the sum of its proper divisors (329639065278).

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

216215515650 is a wasteful number, since it uses less digits than its factorization.

216215515650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36916 (or 36911 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 39.

The spelling of 216215515650 in words is "two hundred sixteen billion, two hundred fifteen million, five hundred fifteen thousand, six hundred fifty".