855556013 has 4 divisors (see below), whose sum is σ = 921368028. Its totient is φ = 789744000.

The previous prime is 855556003. The next prime is 855556033. The reversal of 855556013 is 310655558.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 310655558 = 2 ⋅155327779.

It can be written as a sum of positive squares in 2 ways, for example, as 154206724 + 701349289 = 12418^2 + 26483^2 .

It is a cyclic number.

It is not a de Polignac number, because 855556013 - 2¹⁸ = 855293869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (855556003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32905988 + ... + 32906013.

It is an arithmetic number, because the mean of its divisors is an integer number (230342007).

Almost surely, 2^855556013 is an apocalyptic number.

It is an amenable number.

855556013 is a deficient number, since it is larger than the sum of its proper divisors (65812015).

855556013 is a wasteful number, since it uses less digits than its factorization.

855556013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65812014.

The product of its (nonzero) digits is 90000, while the sum is 38.

The square root of 855556013 is about 29249.8891109009. The cubic root of 855556013 is about 949.3276916373.

The spelling of 855556013 in words is "eight hundred fifty-five million, five hundred fifty-six thousand, thirteen".