66823899 has 8 divisors (see below), whose sum is σ = 89198160. Its totient is φ = 44499456.

The previous prime is 66823877. The next prime is 66823909. The reversal of 66823899 is 99832866.

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

It is not a de Polignac number, because 66823899 - 2¹¹ = 66821851 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (66823819) 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, 9202 + ... + 14775.

It is an arithmetic number, because the mean of its divisors is an integer number (11149770).

Almost surely, 2^66823899 is an apocalyptic number.

66823899 is a deficient number, since it is larger than the sum of its proper divisors (22374261).

66823899 is a wasteful number, since it uses less digits than its factorization.

66823899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24909.

The product of its digits is 1119744, while the sum is 51.

The square root of 66823899 is about 8174.5886135022. The cubic root of 66823899 is about 405.7986556962.

The spelling of 66823899 in words is "sixty-six million, eight hundred twenty-three thousand, eight hundred ninety-nine".