555123321555 has 128 divisors (see below), whose sum is σ = 1015542614016. Its totient is φ = 256520908800.

The previous prime is 555123321553. The next prime is 555123321559.

555123321555 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 555123321555 - 2¹ = 555123321553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (555123321553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 303179490 + ... + 303181320.

It is an arithmetic number, because the mean of its divisors is an integer number (7933926672).

Almost surely, 2^555123321555 is an apocalyptic number.

555123321555 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

555123321555 is a deficient number, since it is larger than the sum of its proper divisors (460419292461).

555123321555 is a wasteful number, since it uses less digits than its factorization.

555123321555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2877.

The product of its digits is 562500, while the sum is 42.

It can be divided in two parts, 555123 and 321555, that added together give a palindrome (876678).

The spelling of 555123321555 in words is "five hundred fifty-five billion, one hundred twenty-three million, three hundred twenty-one thousand, five hundred fifty-five".