855124421559 has 4 divisors (see below), whose sum is σ = 1140165895416. Its totient is φ = 570082947704.

The previous prime is 855124421539. The next prime is 855124421573. The reversal of 855124421559 is 955124421558.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 855124421559 - 2¹⁵ = 855124388791 is a prime.

It is a super-2 number, since 2×855124421559² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (855124421539) 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, 142520736924 + ... + 142520736929.

It is an arithmetic number, because the mean of its divisors is an integer number (285041473854).

Almost surely, 2^855124421559 is an apocalyptic number.

855124421559 is a deficient number, since it is larger than the sum of its proper divisors (285041473857).

855124421559 is a wasteful number, since it uses less digits than its factorization.

855124421559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285041473856.

The product of its digits is 2880000, while the sum is 51.

Subtracting 855124421559 from its reverse (955124421558), we obtain a palindrome (99999999999).

The spelling of 855124421559 in words is "eight hundred fifty-five billion, one hundred twenty-four million, four hundred twenty-one thousand, five hundred fifty-nine".