123135125540155 has 8 divisors (see below), whose sum is σ = 147762211053600. Its totient is φ = 98508060161856.

The previous prime is 123135125540137. The next prime is 123135125540171. The reversal of 123135125540155 is 551045521531321.

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 123135125540155 - 2¹⁹ = 123135125015867 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18011266 + ... + 23888824.

It is an arithmetic number, because the mean of its divisors is an integer number (18470276381700).

Almost surely, 2^{123135125540155} is an apocalyptic number.

123135125540155 is a deficient number, since it is larger than the sum of its proper divisors (24627085513445).

123135125540155 is an equidigital number, since it uses as much as digits as its factorization.

123135125540155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10067573.

The product of its (nonzero) digits is 450000, while the sum is 43.

The spelling of 123135125540155 in words is "one hundred twenty-three trillion, one hundred thirty-five billion, one hundred twenty-five million, five hundred forty thousand, one hundred fifty-five".