155555104123 has 32 divisors (see below), whose sum is σ = 163261486080. Its totient is φ = 148096408320.

The previous prime is 155555104109. The next prime is 155555104127. The reversal of 155555104123 is 321401555551.

It is a cyclic number.

It is not a de Polignac number, because 155555104123 - 2⁹ = 155555103611 is a prime.

It is a super-3 number, since 3×155555104123³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155555104127) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 109314190 + ... + 109315612.

It is an arithmetic number, because the mean of its divisors is an integer number (5101921440).

Almost surely, 2^155555104123 is an apocalyptic number.

155555104123 is a deficient number, since it is larger than the sum of its proper divisors (7706381957).

155555104123 is a wasteful number, since it uses less digits than its factorization.

155555104123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1939.

The product of its (nonzero) digits is 75000, while the sum is 37.

Adding to 155555104123 its reverse (321401555551), we get a palindrome (476956659674).

The spelling of 155555104123 in words is "one hundred fifty-five billion, five hundred fifty-five million, one hundred four thousand, one hundred twenty-three".