217171473042655 has 16 divisors (see below), whose sum is σ = 266727098271744. Its totient is φ = 169658131698720.

The previous prime is 217171473042619. The next prime is 217171473042677. The reversal of 217171473042655 is 556240374171712.

It is not a de Polignac number, because 217171473042655 - 2²³ = 217171464654047 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 217171473042596 and 217171473042605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 114075279 + ... + 115963408.

It is an arithmetic number, because the mean of its divisors is an integer number (16670443641984).

Almost surely, 2^{217171473042655} is an apocalyptic number.

217171473042655 is a deficient number, since it is larger than the sum of its proper divisors (49555625229089).

217171473042655 is a wasteful number, since it uses less digits than its factorization.

217171473042655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230043126.

The product of its (nonzero) digits is 9878400, while the sum is 55.

The spelling of 217171473042655 in words is "two hundred seventeen trillion, one hundred seventy-one billion, four hundred seventy-three million, forty-two thousand, six hundred fifty-five".