217650465256 has 96 divisors (see below), whose sum is σ = 479519688960. Its totient is φ = 90693098496.

The previous prime is 217650465247. The next prime is 217650465271. The reversal of 217650465256 is 652564056712.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37895521 + ... + 37901263.

It is an arithmetic number, because the mean of its divisors is an integer number (4994996760).

Almost surely, 2^217650465256 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 217650465256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (239759844480).

217650465256 is an abundant number, since it is smaller than the sum of its proper divisors (261869223704).

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

217650465256 is a wasteful number, since it uses less digits than its factorization.

217650465256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6035 (or 5918 counting only the distinct ones).

The product of its (nonzero) digits is 3024000, while the sum is 49.

The spelling of 217650465256 in words is "two hundred seventeen billion, six hundred fifty million, four hundred sixty-five thousand, two hundred fifty-six".