217648440795 has 16 divisors (see below), whose sum is σ = 359470973952. Its totient is φ = 112334678880.

The previous prime is 217648440791. The next prime is 217648440833. The reversal of 217648440795 is 597044846712.

It is not a de Polignac number, because 217648440795 - 2² = 217648440791 is a prime.

It is not an unprimeable number, because it can be changed into a prime (217648440791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 234030117 + ... + 234031046.

It is an arithmetic number, because the mean of its divisors is an integer number (22466935872).

Almost surely, 2^217648440795 is an apocalyptic number.

217648440795 is a deficient number, since it is larger than the sum of its proper divisors (141822533157).

217648440795 is a wasteful number, since it uses less digits than its factorization.

217648440795 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 468061202.

The product of its (nonzero) digits is 13547520, while the sum is 57.

The spelling of 217648440795 in words is "two hundred seventeen billion, six hundred forty-eight million, four hundred forty thousand, seven hundred ninety-five".