217644597113 has 2 divisors, whose sum is σ = 217644597114. Its totient is φ = 217644597112.

The previous prime is 217644597097. The next prime is 217644597119. The reversal of 217644597113 is 311795446712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 211169659024 + 6474938089 = 459532^2 + 80467^2 .

It is a cyclic number.

It is not a de Polignac number, because 217644597113 - 2⁴ = 217644597097 is a prime.

It is not a weakly prime, because it can be changed into another prime (217644597119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108822298556 + 108822298557.

It is an arithmetic number, because the mean of its divisors is an integer number (108822298557).

Almost surely, 2^217644597113 is an apocalyptic number.

It is an amenable number.

217644597113 is a deficient number, since it is larger than the sum of its proper divisors (1).

217644597113 is an equidigital number, since it uses as much as digits as its factorization.

217644597113 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1270080, while the sum is 50.

The spelling of 217644597113 in words is "two hundred seventeen billion, six hundred forty-four million, five hundred ninety-seven thousand, one hundred thirteen".