216434378593 has 4 divisors (see below), whose sum is σ = 216462965908. Its totient is φ = 216405791280.

The previous prime is 216434378549. The next prime is 216434378617. The reversal of 216434378593 is 395873434612.

It is a happy number.

216434378593 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 216310568464 + 123810129 = 465092^2 + 11127^2 .

It is a cyclic number.

It is not a de Polignac number, because 216434378593 - 2⁹ = 216434378081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216434378513) 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 3 ways as a sum of consecutive naturals, for example, 14282298 + ... + 14297443.

It is an arithmetic number, because the mean of its divisors is an integer number (54115741477).

Almost surely, 2^216434378593 is an apocalyptic number.

It is an amenable number.

216434378593 is a deficient number, since it is larger than the sum of its proper divisors (28587315).

216434378593 is an equidigital number, since it uses as much as digits as its factorization.

216434378593 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28587314.

The product of its digits is 13063680, while the sum is 55.

The spelling of 216434378593 in words is "two hundred sixteen billion, four hundred thirty-four million, three hundred seventy-eight thousand, five hundred ninety-three".