217309617046672 has 20 divisors (see below), whose sum is σ = 421040419367040. Its totient is φ = 108654024951968.

The previous prime is 217309617046667. The next prime is 217309617046673. The reversal of 217309617046672 is 276640716903712.

It is a self number, because there is not a number n which added to its sum of digits gives 217309617046672.

It is not an unprimeable number, because it can be changed into a prime (217309617046673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46681972 + ... + 51125587.

It is an arithmetic number, because the mean of its divisors is an integer number (21052020968352).

Almost surely, 2^{217309617046672} is an apocalyptic number.

It is an amenable number.

217309617046672 is a deficient number, since it is larger than the sum of its proper divisors (203730802320368).

217309617046672 is a wasteful number, since it uses less digits than its factorization.

217309617046672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97946430 (or 97946424 counting only the distinct ones).

The product of its (nonzero) digits is 32006016, while the sum is 61.

The spelling of 217309617046672 in words is "two hundred seventeen trillion, three hundred nine billion, six hundred seventeen million, forty-six thousand, six hundred seventy-two".