135809666 has 8 divisors (see below), whose sum is σ = 203798784. Its totient is φ = 67876740.

The previous prime is 135809623. The next prime is 135809669. The reversal of 135809666 is 666908531.

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 (135809669) 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, 7370 + ... + 18053.

It is an arithmetic number, because the mean of its divisors is an integer number (25474848).

Almost surely, 2^135809666 is an apocalyptic number.

135809666 is a deficient number, since it is larger than the sum of its proper divisors (67989118).

135809666 is a wasteful number, since it uses less digits than its factorization.

135809666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28096.

The product of its (nonzero) digits is 233280, while the sum is 44.

The square root of 135809666 is about 11653.7404295788. The cubic root of 135809666 is about 514.0163030353.

The spelling of 135809666 in words is "one hundred thirty-five million, eight hundred nine thousand, six hundred sixty-six".