66135009 has 16 divisors (see below), whose sum is σ = 91615104. Its totient is φ = 42403200.

The previous prime is 66134923. The next prime is 66135023. The reversal of 66135009 is 90053166.

It is a happy number.

It is not a de Polignac number, because 66135009 - 2⁸ = 66134753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66135089) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4947 + ... + 12519.

It is an arithmetic number, because the mean of its divisors is an integer number (5725944).

Almost surely, 2^66135009 is an apocalyptic number.

It is an amenable number.

66135009 is a deficient number, since it is larger than the sum of its proper divisors (25480095).

66135009 is a wasteful number, since it uses less digits than its factorization.

66135009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7688.

The product of its (nonzero) digits is 4860, while the sum is 30.

The square root of 66135009 is about 8132.3433892083. The cubic root of 66135009 is about 404.3993718444.

The spelling of 66135009 in words is "sixty-six million, one hundred thirty-five thousand, nine".