135123107705 has 4 divisors (see below), whose sum is σ = 162147729252. Its totient is φ = 108098486160.

The previous prime is 135123107701. The next prime is 135123107719. The reversal of 135123107705 is 507701321531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 507701321531 = 307 ⋅1653750233.

It can be written as a sum of positive squares in 2 ways, for example, as 35482503424 + 99640604281 = 188368^2 + 315659^2 .

It is not a de Polignac number, because 135123107705 - 2² = 135123107701 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135123107701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13512310766 + ... + 13512310775.

It is an arithmetic number, because the mean of its divisors is an integer number (40536932313).

Almost surely, 2^135123107705 is an apocalyptic number.

It is an amenable number.

135123107705 is a deficient number, since it is larger than the sum of its proper divisors (27024621547).

135123107705 is an equidigital number, since it uses as much as digits as its factorization.

135123107705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27024621546.

The product of its (nonzero) digits is 22050, while the sum is 35.

The spelling of 135123107705 in words is "one hundred thirty-five billion, one hundred twenty-three million, one hundred seven thousand, seven hundred five".