217612668746 has 16 divisors (see below), whose sum is σ = 356118886368. Its totient is φ = 98907786000.

The previous prime is 217612668727. The next prime is 217612668803. The reversal of 217612668746 is 647866216712.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 217612668691 and 217612668700.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31580 + ... + 660471.

It is an arithmetic number, because the mean of its divisors is an integer number (22257430398).

Almost surely, 2^217612668746 is an apocalyptic number.

217612668746 is a deficient number, since it is larger than the sum of its proper divisors (138506217622).

217612668746 is a wasteful number, since it uses less digits than its factorization.

217612668746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706357.

The product of its digits is 8128512, while the sum is 56.

The spelling of 217612668746 in words is "two hundred seventeen billion, six hundred twelve million, six hundred sixty-eight thousand, seven hundred forty-six".