217083729709 has 16 divisors (see below), whose sum is σ = 273910694400. Its totient is φ = 167118122160.

The previous prime is 217083729701. The next prime is 217083729761. The reversal of 217083729709 is 907927380712.

It is a happy number.

It is not a de Polignac number, because 217083729709 - 2³ = 217083729701 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 217083729709.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217083729701) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16977159 + ... + 16989940.

It is an arithmetic number, because the mean of its divisors is an integer number (17119418400).

Almost surely, 2^217083729709 is an apocalyptic number.

It is an amenable number.

217083729709 is a deficient number, since it is larger than the sum of its proper divisors (56826964691).

217083729709 is a wasteful number, since it uses less digits than its factorization.

217083729709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33967200.

The product of its (nonzero) digits is 2667168, while the sum is 55.

The spelling of 217083729709 in words is "two hundred seventeen billion, eighty-three million, seven hundred twenty-nine thousand, seven hundred nine".