66387458809 has 8 divisors (see below), whose sum is σ = 75922211520. Its totient is φ = 56865413616.

The previous prime is 66387458771. The next prime is 66387458867. The reversal of 66387458809 is 90885478366.

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 66387458809 - 2²⁵ = 66353904377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66387458609) 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, 3165679 + ... + 3186580.

It is an arithmetic number, because the mean of its divisors is an integer number (9490276440).

Almost surely, 2^66387458809 is an apocalyptic number.

It is an amenable number.

66387458809 is a deficient number, since it is larger than the sum of its proper divisors (9534752711).

66387458809 is a wasteful number, since it uses less digits than its factorization.

66387458809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6353759.

The product of its (nonzero) digits is 69672960, while the sum is 64.

The spelling of 66387458809 in words is "sixty-six billion, three hundred eighty-seven million, four hundred fifty-eight thousand, eight hundred nine".