217658068992 has 1404 divisors, whose sum is σ = 853036164864. Its totient is φ = 53137244160.

The previous prime is 217658068933. The next prime is 217658069021. The reversal of 217658068992 is 299860856712.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 7021228017 + ... + 7021228047.

It is an arithmetic number, because the mean of its divisors is an integer number (607575616).

Almost surely, 2^217658068992 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 217658068992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (426518082432).

217658068992 is an abundant number, since it is smaller than the sum of its proper divisors (635378095872).

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

217658068992 is a wasteful number, since it uses less digits than its factorization.

217658068992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124 (or 79 counting only the distinct ones).

The product of its (nonzero) digits is 26127360, while the sum is 63.

The spelling of 217658068992 in words is "two hundred seventeen billion, six hundred fifty-eight million, sixty-eight thousand, nine hundred ninety-two".