135720138650673 has 4 divisors (see below), whose sum is σ = 180960184867568. Its totient is φ = 90480092433780.

The previous prime is 135720138650669. The next prime is 135720138650693. The reversal of 135720138650673 is 376056831027531.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 135720138650673 - 2² = 135720138650669 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135720138650693) 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, 22620023108443 + ... + 22620023108448.

It is an arithmetic number, because the mean of its divisors is an integer number (45240046216892).

Almost surely, 2^{135720138650673} is an apocalyptic number.

It is an amenable number.

135720138650673 is a deficient number, since it is larger than the sum of its proper divisors (45240046216895).

135720138650673 is an equidigital number, since it uses as much as digits as its factorization.

135720138650673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45240046216894.

The product of its (nonzero) digits is 19051200, while the sum is 57.

The spelling of 135720138650673 in words is "one hundred thirty-five trillion, seven hundred twenty billion, one hundred thirty-eight million, six hundred fifty thousand, six hundred seventy-three".