135640665 has 12 divisors (see below), whose sum is σ = 235110564. Its totient is φ = 72341664.

The previous prime is 135640657. The next prime is 135640693. The reversal of 135640665 is 566046531.

135640665 is a `hidden beast` number, since 1 + 3 + 5 + 640 + 6 + 6 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 31539456 + 104101209 = 5616^2 + 10203^2 .

It is not a de Polignac number, because 135640665 - 2³ = 135640657 is a prime.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 1507074 + ... + 1507163.

It is an arithmetic number, because the mean of its divisors is an integer number (19592547).

Almost surely, 2^135640665 is an apocalyptic number.

135640665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

135640665 is a deficient number, since it is larger than the sum of its proper divisors (99469899).

135640665 is a wasteful number, since it uses less digits than its factorization.

135640665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3014248 (or 3014245 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The square root of 135640665 is about 11646.4872386484. The cubic root of 135640665 is about 513.8030012629.

The spelling of 135640665 in words is "one hundred thirty-five million, six hundred forty thousand, six hundred sixty-five".