217908253468 has 6 divisors (see below), whose sum is σ = 381339443576. Its totient is φ = 108954126732.

The previous prime is 217908253457. The next prime is 217908253471. The reversal of 217908253468 is 864352809712.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 27238531680 + ... + 27238531687.

It is a 1-persistent number, because it is pandigital, but 2⋅217908253468 = 435816506936 is not.

Almost surely, 2^217908253468 is an apocalyptic number.

It is an amenable number.

217908253468 is a deficient number, since it is larger than the sum of its proper divisors (163431190108).

217908253468 is a wasteful number, since it uses less digits than its factorization.

217908253468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54477063371 (or 54477063369 counting only the distinct ones).

The product of its (nonzero) digits is 5806080, while the sum is 55.

The spelling of 217908253468 in words is "two hundred seventeen billion, nine hundred eight million, two hundred fifty-three thousand, four hundred sixty-eight".