217403660472 has 128 divisors (see below), whose sum is σ = 601328655360. Its totient is φ = 65149736960.

The previous prime is 217403660443. The next prime is 217403660473. The reversal of 217403660472 is 274066304712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217403660473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6956722 + ... + 6987902.

It is an arithmetic number, because the mean of its divisors is an integer number (4697880120).

Almost surely, 2^217403660472 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 217403660472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (300664327680).

217403660472 is an abundant number, since it is smaller than the sum of its proper divisors (383924994888).

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

217403660472 is a wasteful number, since it uses less digits than its factorization.

217403660472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31973 (or 31969 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 42.

The spelling of 217403660472 in words is "two hundred seventeen billion, four hundred three million, six hundred sixty thousand, four hundred seventy-two".