135681835613 has 4 divisors (see below), whose sum is σ = 137316556608. Its totient is φ = 134047114620.

The previous prime is 135681835571. The next prime is 135681835621. The reversal of 135681835613 is 316538186531.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 135681835613 - 2²⁰ = 135680787037 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 (135681835013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 817360373 + ... + 817360538.

It is an arithmetic number, because the mean of its divisors is an integer number (34329139152).

Almost surely, 2^135681835613 is an apocalyptic number.

It is an amenable number.

135681835613 is a deficient number, since it is larger than the sum of its proper divisors (1634720995).

135681835613 is an equidigital number, since it uses as much as digits as its factorization.

135681835613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1634720994.

The product of its digits is 1555200, while the sum is 50.

The spelling of 135681835613 in words is "one hundred thirty-five billion, six hundred eighty-one million, eight hundred thirty-five thousand, six hundred thirteen".