135648780044781 has 4 divisors (see below), whose sum is σ = 180865040059712. Its totient is φ = 90432520029852.

The previous prime is 135648780044731. The next prime is 135648780044933. The reversal of 135648780044781 is 187440087846531.

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 135648780044781 - 2¹⁰ = 135648780043757 is a prime.

It is a super-2 number, since 2×135648780044781² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135648780044731) 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, 22608130007461 + ... + 22608130007466.

It is an arithmetic number, because the mean of its divisors is an integer number (45216260014928).

Almost surely, 2^{135648780044781} is an apocalyptic number.

It is an amenable number.

135648780044781 is a deficient number, since it is larger than the sum of its proper divisors (45216260014931).

135648780044781 is an equidigital number, since it uses as much as digits as its factorization.

135648780044781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45216260014930.

The product of its (nonzero) digits is 144506880, while the sum is 66.

The spelling of 135648780044781 in words is "one hundred thirty-five trillion, six hundred forty-eight billion, seven hundred eighty million, forty-four thousand, seven hundred eighty-one".