217971065732 has 48 divisors (see below), whose sum is σ = 465820629120. Its totient is φ = 87114465792.

The previous prime is 217971065723. The next prime is 217971065771. The reversal of 217971065732 is 237560179712.

It is a super-2 number, since 2×217971065732² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2048678 + ... + 2152445.

It is an arithmetic number, because the mean of its divisors is an integer number (9704596440).

Almost surely, 2^217971065732 is an apocalyptic number.

It is an amenable number.

217971065732 is an abundant number, since it is smaller than the sum of its proper divisors (247849563388).

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

217971065732 is a wasteful number, since it uses less digits than its factorization.

217971065732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4201260 (or 4201258 counting only the distinct ones).

The product of its (nonzero) digits is 1111320, while the sum is 50.

The spelling of 217971065732 in words is "two hundred seventeen billion, nine hundred seventy-one million, sixty-five thousand, seven hundred thirty-two".