66625009 has 8 divisors (see below), whose sum is σ = 72836928. Its totient is φ = 60438960.

The previous prime is 66625007. The next prime is 66625037. The reversal of 66625009 is 90052666.

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

It is a cyclic number.

It is not a de Polignac number, because 66625009 - 2¹ = 66625007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66625007) 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 7 ways as a sum of consecutive naturals, for example, 862 + ... + 11575.

It is an arithmetic number, because the mean of its divisors is an integer number (9104616).

Almost surely, 2^66625009 is an apocalyptic number.

It is an amenable number.

66625009 is a deficient number, since it is larger than the sum of its proper divisors (6211919).

66625009 is a wasteful number, since it uses less digits than its factorization.

66625009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12935.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 66625009 is about 8162.4144099647. The cubic root of 66625009 is about 405.3956586596.

The spelling of 66625009 in words is "sixty-six million, six hundred twenty-five thousand, nine".