217845472056 has 16 divisors (see below), whose sum is σ = 544613680200. Its totient is φ = 72615157344.

The previous prime is 217845472043. The next prime is 217845472069. The reversal of 217845472056 is 650274548712.

It is an interprime number because it is at equal distance from previous prime (217845472043) and next prime (217845472069).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4538447311 + ... + 4538447358.

Almost surely, 2^217845472056 is an apocalyptic number.

It is an amenable number.

217845472056 is an abundant number, since it is smaller than the sum of its proper divisors (326768208144).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

217845472056 is a wasteful number, since it uses less digits than its factorization.

217845472056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9076894678 (or 9076894674 counting only the distinct ones).

The product of its (nonzero) digits is 3763200, while the sum is 51.

The spelling of 217845472056 in words is "two hundred seventeen billion, eight hundred forty-five million, four hundred seventy-two thousand, fifty-six".