123405001153555 has 32 divisors (see below), whose sum is σ = 171061239400128. Its totient is φ = 84464780697600.

The previous prime is 123405001153493. The next prime is 123405001153559. The reversal of 123405001153555 is 555351100504321.

It is not a de Polignac number, because 123405001153555 - 2¹⁷ = 123405001022483 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123405001153559) 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 31 ways as a sum of consecutive naturals, for example, 12121195 + ... + 19842715.

It is an arithmetic number, because the mean of its divisors is an integer number (5345663731254).

Almost surely, 2^{123405001153555} is an apocalyptic number.

123405001153555 is a deficient number, since it is larger than the sum of its proper divisors (47656238246573).

123405001153555 is a wasteful number, since it uses less digits than its factorization.

123405001153555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7738647.

The product of its (nonzero) digits is 225000, while the sum is 40.

Adding to 123405001153555 its reverse (555351100504321), we get a palindrome (678756101657876).

The spelling of 123405001153555 in words is "one hundred twenty-three trillion, four hundred five billion, one million, one hundred fifty-three thousand, five hundred fifty-five".