217642823708 has 24 divisors (see below), whose sum is σ = 388284792000. Its totient is φ = 106722802368.

The previous prime is 217642823687. The next prime is 217642823779. The reversal of 217642823708 is 807328246712.

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 in 7 ways as a sum of consecutive naturals, for example, 2264135 + ... + 2358302.

It is an arithmetic number, because the mean of its divisors is an integer number (16178533000).

Almost surely, 2^217642823708 is an apocalyptic number.

It is an amenable number.

217642823708 is a deficient number, since it is larger than the sum of its proper divisors (170641968292).

217642823708 is a wasteful number, since it uses less digits than its factorization.

217642823708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4622669 (or 4622667 counting only the distinct ones).

The product of its (nonzero) digits is 1806336, while the sum is 50.

The spelling of 217642823708 in words is "two hundred seventeen billion, six hundred forty-two million, eight hundred twenty-three thousand, seven hundred eight".