66447799 has 8 divisors (see below), whose sum is σ = 73207440. Its totient is φ = 59808000.

The previous prime is 66447791. The next prime is 66447803. The reversal of 66447799 is 99774466.

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 66447799 - 2³ = 66447791 is a prime.

It is a Duffinian number.

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 (66447791) 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, 28794 + ... + 31015.

It is an arithmetic number, because the mean of its divisors is an integer number (9150930).

Almost surely, 2^66447799 is an apocalyptic number.

66447799 is a deficient number, since it is larger than the sum of its proper divisors (6759641).

66447799 is a wasteful number, since it uses less digits than its factorization.

66447799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59921.

The product of its digits is 2286144, while the sum is 52.

The square root of 66447799 is about 8151.5519381281. The cubic root of 66447799 is about 405.0359141042.

The spelling of 66447799 in words is "sixty-six million, four hundred forty-seven thousand, seven hundred ninety-nine".