217542976208 has 10 divisors (see below), whose sum is σ = 421489516434. Its totient is φ = 108771488096.

The previous prime is 217542976181. The next prime is 217542976229. The reversal of 217542976208 is 802679245712.

It can be written as a sum of positive squares in only one way, i.e., 217428229264 + 114746944 = 466292^2 + 10712^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 217542976208.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6798217991 + ... + 6798218022.

Almost surely, 2^217542976208 is an apocalyptic number.

It is an amenable number.

217542976208 is a deficient number, since it is larger than the sum of its proper divisors (203946540226).

217542976208 is a wasteful number, since it uses less digits than its factorization.

217542976208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13596436021 (or 13596436015 counting only the distinct ones).

The product of its (nonzero) digits is 3386880, while the sum is 53.

The spelling of 217542976208 in words is "two hundred seventeen billion, five hundred forty-two million, nine hundred seventy-six thousand, two hundred eight".