135661686441767 has 4 divisors (see below), whose sum is σ = 142801775201880. Its totient is φ = 128521597681656.

The previous prime is 135661686441751. The next prime is 135661686441773. The reversal of 135661686441767 is 767144686166531.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 135661686441767 - 2⁴ = 135661686441751 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 135661686441767.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135661686441727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3570044380028 + ... + 3570044380065.

It is an arithmetic number, because the mean of its divisors is an integer number (35700443800470).

Almost surely, 2^{135661686441767} is an apocalyptic number.

135661686441767 is a deficient number, since it is larger than the sum of its proper divisors (7140088760113).

135661686441767 is an equidigital number, since it uses as much as digits as its factorization.

135661686441767 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7140088760112.

The product of its digits is 731566080, while the sum is 71.

The spelling of 135661686441767 in words is "one hundred thirty-five trillion, six hundred sixty-one billion, six hundred eighty-six million, four hundred forty-one thousand, seven hundred sixty-seven".