66009999 has 8 divisors (see below), whose sum is σ = 96014592. Its totient is φ = 40006040.

The previous prime is 66009973. The next prime is 66010013. The reversal of 66009999 is 99990066.

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 66009999 - 2⁷ = 66009871 is a prime.

66009999 is a modest number, since divided by 9999 gives 6600 as remainder.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66009299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1000119 + ... + 1000184.

It is an arithmetic number, because the mean of its divisors is an integer number (12001824).

Almost surely, 2^66009999 is an apocalyptic number.

66009999 is a deficient number, since it is larger than the sum of its proper divisors (30004593).

66009999 is a wasteful number, since it uses less digits than its factorization.

66009999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2000317.

The product of its (nonzero) digits is 236196, while the sum is 48.

The square root of 66009999 is about 8124.6537772388. The cubic root of 66009999 is about 404.1444092938.

The spelling of 66009999 in words is "sixty-six million, nine thousand, nine hundred ninety-nine".