817505434385 has 8 divisors (see below), whose sum is σ = 1014834332520. Its totient is φ = 631452473344.

The previous prime is 817505434373. The next prime is 817505434393. The reversal of 817505434385 is 583434505718.

It can be written as a sum of positive squares in 4 ways, for example, as 35540167441 + 781965266944 = 188521^2 + 884288^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 817505434385 - 2⁶ = 817505434321 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2818984112 + ... + 2818984401.

It is an arithmetic number, because the mean of its divisors is an integer number (126854291565).

Almost surely, 2^817505434385 is an apocalyptic number.

It is an amenable number.

817505434385 is a deficient number, since it is larger than the sum of its proper divisors (197328898135).

817505434385 is a wasteful number, since it uses less digits than its factorization.

817505434385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5637968547.

The product of its (nonzero) digits is 8064000, while the sum is 53.

The spelling of 817505434385 in words is "eight hundred seventeen billion, five hundred five million, four hundred thirty-four thousand, three hundred eighty-five".