217558404855713 has 64 divisors (see below), whose sum is σ = 233235600998400. Its totient is φ = 202348747883520.

The previous prime is 217558404855641. The next prime is 217558404855797. The reversal of 217558404855713 is 317558404855712.

It is a cyclic number.

It is not a de Polignac number, because 217558404855713 - 2¹⁴ = 217558404839329 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 217558404855713.

It is not an unprimeable number, because it can be changed into a prime (217558404855013) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 128504668295 + ... + 128504669987.

It is an arithmetic number, because the mean of its divisors is an integer number (3644306265600).

Almost surely, 2^{217558404855713} is an apocalyptic number.

It is an amenable number.

217558404855713 is a deficient number, since it is larger than the sum of its proper divisors (15677196142687).

217558404855713 is a wasteful number, since it uses less digits than its factorization.

217558404855713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3142.

The product of its (nonzero) digits is 188160000, while the sum is 65.

Subtracting 217558404855713 from its reverse (317558404855712), we obtain a palindrome (99999999999999).

The spelling of 217558404855713 in words is "two hundred seventeen trillion, five hundred fifty-eight billion, four hundred four million, eight hundred fifty-five thousand, seven hundred thirteen".