217868311055 has 8 divisors (see below), whose sum is σ = 263007495072. Its totient is φ = 173250967648.

The previous prime is 217868311043. The next prime is 217868311081. The reversal of 217868311055 is 550113868712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 217868311055 - 2²² = 217864116751 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130459232 + ... + 130460901.

It is an arithmetic number, because the mean of its divisors is an integer number (32875936884).

Almost surely, 2^217868311055 is an apocalyptic number.

217868311055 is a deficient number, since it is larger than the sum of its proper divisors (45139184017).

217868311055 is a wasteful number, since it uses less digits than its factorization.

217868311055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260920305.

The product of its (nonzero) digits is 403200, while the sum is 47.

The spelling of 217868311055 in words is "two hundred seventeen billion, eight hundred sixty-eight million, three hundred eleven thousand, fifty-five".