217255830065 has 16 divisors (see below), whose sum is σ = 277174960128. Its totient is φ = 163111181376.

The previous prime is 217255830047. The next prime is 217255830119. The reversal of 217255830065 is 560038552712.

It is a cyclic number.

It is not a de Polignac number, because 217255830065 - 2²⁰ = 217254781489 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 217255829998 and 217255830025.

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, 17816369 + ... + 17828558.

It is an arithmetic number, because the mean of its divisors is an integer number (17323435008).

Almost surely, 2^217255830065 is an apocalyptic number.

It is an amenable number.

217255830065 is a deficient number, since it is larger than the sum of its proper divisors (59919130063).

217255830065 is a wasteful number, since it uses less digits than its factorization.

217255830065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35645008.

The product of its (nonzero) digits is 504000, while the sum is 44.

The spelling of 217255830065 in words is "two hundred seventeen billion, two hundred fifty-five million, eight hundred thirty thousand, sixty-five".