217418115893 has 6 divisors (see below), whose sum is σ = 238980243222. Its totient is φ = 197652832520.

The previous prime is 217418115877. The next prime is 217418115907. The reversal of 217418115893 is 398511814712.

217418115893 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 199579308049 + 17838807844 = 446743^2 + 133562^2 .

It is not a de Polignac number, because 217418115893 - 2⁴ = 217418115877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217418115823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 898421846 + ... + 898422087.

It is an arithmetic number, because the mean of its divisors is an integer number (39830040537).

Almost surely, 2^217418115893 is an apocalyptic number.

It is an amenable number.

217418115893 is a deficient number, since it is larger than the sum of its proper divisors (21562127329).

217418115893 is a wasteful number, since it uses less digits than its factorization.

217418115893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1796843955 (or 1796843944 counting only the distinct ones).

The product of its digits is 483840, while the sum is 50.

The spelling of 217418115893 in words is "two hundred seventeen billion, four hundred eighteen million, one hundred fifteen thousand, eight hundred ninety-three".