66232609 has 4 divisors (see below), whose sum is σ = 66284820. Its totient is φ = 66180400.

The previous prime is 66232601. The next prime is 66232619. The reversal of 66232609 is 90623266.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5626384 + 60606225 = 2372^2 + 7785^2 .

It is a cyclic number.

It is not a de Polignac number, because 66232609 - 2³ = 66232601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66232601) 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, 24154 + ... + 26755.

It is an arithmetic number, because the mean of its divisors is an integer number (16571205).

Almost surely, 2^66232609 is an apocalyptic number.

It is an amenable number.

66232609 is a deficient number, since it is larger than the sum of its proper divisors (52211).

66232609 is a wasteful number, since it uses less digits than its factorization.

66232609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52210.

The product of its (nonzero) digits is 23328, while the sum is 34.

The square root of 66232609 is about 8138.3419072929. The cubic root of 66232609 is about 404.5982074248.

The spelling of 66232609 in words is "sixty-six million, two hundred thirty-two thousand, six hundred nine".