135686618 has 8 divisors (see below), whose sum is σ = 204404148. Its totient is φ = 67551904.

The previous prime is 135686611. The next prime is 135686623. The reversal of 135686618 is 816686531.

It can be written as a sum of positive squares in 2 ways, for example, as 114554209 + 21132409 = 10703^2 + 4597^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (135686611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 145121 + ... + 146052.

Almost surely, 2^135686618 is an apocalyptic number.

135686618 is a deficient number, since it is larger than the sum of its proper divisors (68717530).

135686618 is a wasteful number, since it uses less digits than its factorization.

135686618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291408.

The product of its digits is 207360, while the sum is 44.

The square root of 135686618 is about 11648.4598982011. The cubic root of 135686618 is about 513.8610175996.

The spelling of 135686618 in words is "one hundred thirty-five million, six hundred eighty-six thousand, six hundred eighteen".