856165505 has 8 divisors (see below), whose sum is σ = 1106429352. Its totient is φ = 632245248.

The previous prime is 856165469. The next prime is 856165511. The reversal of 856165505 is 505561658.

It can be written as a sum of positive squares in 4 ways, for example, as 2999824 + 853165681 = 1732^2 + 29209^2 .

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 856165505 - 2¹⁰ = 856164481 is a prime.

It is a Duffinian number.

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, 6585824 + ... + 6585953.

It is an arithmetic number, because the mean of its divisors is an integer number (138303669).

Almost surely, 2^856165505 is an apocalyptic number.

It is an amenable number.

856165505 is a deficient number, since it is larger than the sum of its proper divisors (250263847).

856165505 is a wasteful number, since it uses less digits than its factorization.

856165505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13171795.

The product of its (nonzero) digits is 180000, while the sum is 41.

The square root of 856165505 is about 29260.3059621734. The cubic root of 856165505 is about 949.5530695515.

The spelling of 856165505 in words is "eight hundred fifty-six million, one hundred sixty-five thousand, five hundred five".