855638017 has 4 divisors (see below), whose sum is σ = 921456340. Its totient is φ = 789819696.

The previous prime is 855637957. The next prime is 855638023. The reversal of 855638017 is 710836558.

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 35331136 + 820306881 = 5944^2 + 28641^2 .

It is a cyclic number.

It is not a de Polignac number, because 855638017 - 2⁷ = 855637889 is a prime.

It is a super-2 number, since 2×855638017² = 1464232832271384578, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (855638117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32909142 + ... + 32909167.

It is an arithmetic number, because the mean of its divisors is an integer number (230364085).

It is a Proth number, since it is equal to 51 ⋅ 2²⁴ + 1 and 51 < 2²⁴.

Almost surely, 2^855638017 is an apocalyptic number.

It is an amenable number.

855638017 is a deficient number, since it is larger than the sum of its proper divisors (65818323).

855638017 is a wasteful number, since it uses less digits than its factorization.

855638017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65818322.

The product of its (nonzero) digits is 201600, while the sum is 43.

The square root of 855638017 is about 29251.2908604048. The cubic root of 855638017 is about 949.3580213020.

The spelling of 855638017 in words is "eight hundred fifty-five million, six hundred thirty-eight thousand, seventeen".