855642459317 has 2 divisors, whose sum is σ = 855642459318. Its totient is φ = 855642459316.

The previous prime is 855642459251. The next prime is 855642459383. The reversal of 855642459317 is 713954246558.

855642459317 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (855642459251) and next prime (855642459383).

It can be written as a sum of positive squares in only one way, i.e., 681815169841 + 173827289476 = 825721^2 + 416926^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-855642459317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (855642458317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427821229658 + 427821229659.

It is an arithmetic number, because the mean of its divisors is an integer number (427821229659).

Almost surely, 2^855642459317 is an apocalyptic number.

It is an amenable number.

855642459317 is a deficient number, since it is larger than the sum of its proper divisors (1).

855642459317 is an equidigital number, since it uses as much as digits as its factorization.

855642459317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288000, while the sum is 59.

The spelling of 855642459317 in words is "eight hundred fifty-five billion, six hundred forty-two million, four hundred fifty-nine thousand, three hundred seventeen".