123135441555 has 48 divisors (see below), whose sum is σ = 229345703424. Its totient is φ = 56250452160.

The previous prime is 123135441553. The next prime is 123135441563. The reversal of 123135441555 is 555144531321.

It is not a de Polignac number, because 123135441555 - 2¹ = 123135441553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123135441551) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 987040 + ... + 1104770.

It is an arithmetic number, because the mean of its divisors is an integer number (4778035488).

Almost surely, 2^123135441555 is an apocalyptic number.

123135441555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

123135441555 is a deficient number, since it is larger than the sum of its proper divisors (106210261869).

123135441555 is a wasteful number, since it uses less digits than its factorization.

123135441555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119176 (or 119169 counting only the distinct ones).

The product of its digits is 180000, while the sum is 39.

Adding to 123135441555 its reverse (555144531321), we get a palindrome (678279972876).

The spelling of 123135441555 in words is "one hundred twenty-three billion, one hundred thirty-five million, four hundred forty-one thousand, five hundred fifty-five".