217534077813 has 32 divisors (see below), whose sum is σ = 323994464640. Its totient is φ = 128904249600.

The previous prime is 217534077793. The next prime is 217534077847. The reversal of 217534077813 is 318770435712.

217534077813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 217534077813 - 2⁸ = 217534077557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217534077853) 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 31 ways as a sum of consecutive naturals, for example, 164038 + ... + 679688.

It is an arithmetic number, because the mean of its divisors is an integer number (10124827020).

Almost surely, 2^217534077813 is an apocalyptic number.

It is an amenable number.

217534077813 is a deficient number, since it is larger than the sum of its proper divisors (106460386827).

217534077813 is a wasteful number, since it uses less digits than its factorization.

217534077813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516069.

The product of its (nonzero) digits is 987840, while the sum is 48.

The spelling of 217534077813 in words is "two hundred seventeen billion, five hundred thirty-four million, seventy-seven thousand, eight hundred thirteen".