123125135555 has 8 divisors (see below), whose sum is σ = 147790366992. Its totient is φ = 98473305568.

The previous prime is 123125135543. The next prime is 123125135593. The reversal of 123125135555 is 555531521321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 123125135555 - 2¹⁴ = 123125119171 is a prime.

It is a super-3 number, since 3×123125135555³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3330137 + ... + 3366906.

It is an arithmetic number, because the mean of its divisors is an integer number (18473795874).

Almost surely, 2^123125135555 is an apocalyptic number.

123125135555 is a deficient number, since it is larger than the sum of its proper divisors (24665231437).

123125135555 is an equidigital number, since it uses as much as digits as its factorization.

123125135555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6700725.

The product of its digits is 112500, while the sum is 38.

Adding to 123125135555 its reverse (555531521321), we get a palindrome (678656656876).

The spelling of 123125135555 in words is "one hundred twenty-three billion, one hundred twenty-five million, one hundred thirty-five thousand, five hundred fifty-five".