123243431035155 has 16 divisors (see below), whose sum is σ = 197229577086720. Its totient is φ = 65716467408608.

The previous prime is 123243431035091. The next prime is 123243431035171. The reversal of 123243431035155 is 551530134342321.

It is a cyclic number.

It is not a de Polignac number, because 123243431035155 - 2⁶ = 123243431035091 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 835078557 + ... + 835226126.

It is an arithmetic number, because the mean of its divisors is an integer number (12326848567920).

Almost surely, 2^{123243431035155} is an apocalyptic number.

123243431035155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

123243431035155 is a deficient number, since it is larger than the sum of its proper divisors (73986146051565).

123243431035155 is a wasteful number, since it uses less digits than its factorization.

123243431035155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1670309610.

The product of its (nonzero) digits is 648000, while the sum is 42.

Adding to 123243431035155 its reverse (551530134342321), we get a palindrome (674773565377476).

The spelling of 123243431035155 in words is "one hundred twenty-three trillion, two hundred forty-three billion, four hundred thirty-one million, thirty-five thousand, one hundred fifty-five".