66036509 has 16 divisors (see below), whose sum is σ = 85173120. Its totient is φ = 49680960.

The previous prime is 66036499. The next prime is 66036511. The reversal of 66036509 is 90563066.

It is not a de Polignac number, because 66036509 - 2¹² = 66032413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66036559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12554 + ... + 17019.

It is an arithmetic number, because the mean of its divisors is an integer number (5323320).

Almost surely, 2^66036509 is an apocalyptic number.

It is an amenable number.

66036509 is a deficient number, since it is larger than the sum of its proper divisors (19136611).

66036509 is a wasteful number, since it uses less digits than its factorization.

66036509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29620.

The product of its (nonzero) digits is 29160, while the sum is 35.

The square root of 66036509 is about 8126.2850676062. The cubic root of 66036509 is about 404.1985043022.

The spelling of 66036509 in words is "sixty-six million, thirty-six thousand, five hundred nine".