135639074789 has 4 divisors (see below), whose sum is σ = 136549404300. Its totient is φ = 134728745280.

The previous prime is 135639074719. The next prime is 135639074867. The reversal of 135639074789 is 987470936531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 987470936531 = 272093 ⋅3629167.

It can be written as a sum of positive squares in 2 ways, for example, as 59515505764 + 76123569025 = 243958^2 + 275905^2 .

It is a cyclic number.

It is not a de Polignac number, because 135639074789 - 2²⁰ = 135638026213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135639074719) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 455164532 + ... + 455164829.

It is an arithmetic number, because the mean of its divisors is an integer number (34137351075).

Almost surely, 2^135639074789 is an apocalyptic number.

It is an amenable number.

135639074789 is a deficient number, since it is larger than the sum of its proper divisors (910329511).

135639074789 is an equidigital number, since it uses as much as digits as its factorization.

135639074789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910329510.

The product of its (nonzero) digits is 34292160, while the sum is 62.

The spelling of 135639074789 in words is "one hundred thirty-five billion, six hundred thirty-nine million, seventy-four thousand, seven hundred eighty-nine".