135986658217 has 4 divisors (see below), whose sum is σ = 136390179796. Its totient is φ = 135583136640.

The previous prime is 135986658209. The next prime is 135986658221. The reversal of 135986658217 is 712856689531.

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

It can be written as a sum of positive squares in 2 ways, for example, as 73720938256 + 62265719961 = 271516^2 + 249531^2 .

It is a cyclic number.

It is not a de Polignac number, because 135986658217 - 2³ = 135986658209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135986658287) 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, 201760284 + ... + 201760957.

It is an arithmetic number, because the mean of its divisors is an integer number (34097544949).

Almost surely, 2^135986658217 is an apocalyptic number.

It is an amenable number.

135986658217 is a deficient number, since it is larger than the sum of its proper divisors (403521579).

135986658217 is an equidigital number, since it uses as much as digits as its factorization.

135986658217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403521578.

The product of its digits is 21772800, while the sum is 61.

The spelling of 135986658217 in words is "one hundred thirty-five billion, nine hundred eighty-six million, six hundred fifty-eight thousand, two hundred seventeen".