66719009 has 8 divisors (see below), whose sum is σ = 76950720. Its totient is φ = 56662416.

The previous prime is 66718987. The next prime is 66719017. The reversal of 66719009 is 90091766.

66719009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66719009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66719309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42959 + ... + 44484.

It is an arithmetic number, because the mean of its divisors is an integer number (9618840).

Almost surely, 2^66719009 is an apocalyptic number.

It is an amenable number.

66719009 is a deficient number, since it is larger than the sum of its proper divisors (10231711).

66719009 is a wasteful number, since it uses less digits than its factorization.

66719009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87559.

The product of its (nonzero) digits is 20412, while the sum is 38.

The square root of 66719009 is about 8168.1704805911. The cubic root of 66719009 is about 405.5862241592.

The spelling of 66719009 in words is "sixty-six million, seven hundred nineteen thousand, nine".