855213799585 has 4 divisors (see below), whose sum is σ = 1026256559508. Its totient is φ = 684171039664.

The previous prime is 855213799579. The next prime is 855213799621. The reversal of 855213799585 is 585997312558.

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 561318620944 + 293895178641 = 749212^2 + 542121^2 .

It is a cyclic number.

It is not a de Polignac number, because 855213799585 - 2³ = 855213799577 is a prime.

It is a super-2 number, since 2×855213799585² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 855213799585.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85521379954 + ... + 85521379963.

It is an arithmetic number, because the mean of its divisors is an integer number (256564139877).

Almost surely, 2^855213799585 is an apocalyptic number.

It is an amenable number.

855213799585 is a deficient number, since it is larger than the sum of its proper divisors (171042759923).

855213799585 is a wasteful number, since it uses less digits than its factorization.

855213799585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171042759922.

The product of its digits is 136080000, while the sum is 67.

The spelling of 855213799585 in words is "eight hundred fifty-five billion, two hundred thirteen million, seven hundred ninety-nine thousand, five hundred eighty-five".