855559955557 has 4 divisors (see below), whose sum is σ = 885062023020. Its totient is φ = 826057888096.

The previous prime is 855559955539. The next prime is 855559955561. The reversal of 855559955557 is 755559955558.

855559955557 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 426002930721 + 429557024836 = 652689^2 + 655406^2 .

It is a cyclic number.

It is not a de Polignac number, because 855559955557 - 2¹¹ = 855559953509 is a prime.

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 855559955557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (855559955527) 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, 14751033688 + ... + 14751033745.

It is an arithmetic number, because the mean of its divisors is an integer number (221265505755).

Almost surely, 2^855559955557 is an apocalyptic number.

It is an amenable number.

855559955557 is a deficient number, since it is larger than the sum of its proper divisors (29502067463).

855559955557 is a wasteful number, since it uses less digits than its factorization.

855559955557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29502067462.

The product of its digits is 1771875000, while the sum is 73.

Subtracting from 855559955557 its reverse (755559955558), we obtain a palindrome (99999999999).

The spelling of 855559955557 in words is "eight hundred fifty-five billion, five hundred fifty-nine million, nine hundred fifty-five thousand, five hundred fifty-seven".