135665 has 8 divisors (see below), whose sum is σ = 166848. Its totient is φ = 105840.

The previous prime is 135661. The next prime is 135671. The reversal of 135665 is 566531.

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

It is not a de Polignac number, because 135665 - 2² = 135661 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (135661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101 + ... + 530.

It is an arithmetic number, because the mean of its divisors is an integer number (20856).

2¹³⁵⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

135665 is a deficient number, since it is larger than the sum of its proper divisors (31183).

135665 is an equidigital number, since it uses as much as digits as its factorization.

135665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 679.

The product of its digits is 2700, while the sum is 26.

The square root of 135665 is about 368.3273001014. The cubic root of 135665 is about 51.3833726189.

The spelling of 135665 in words is "one hundred thirty-five thousand, six hundred sixty-five".