66384715 has 8 divisors (see below), whose sum is σ = 80197200. Its totient is φ = 52750752.

The previous prime is 66384713. The next prime is 66384719. The reversal of 66384715 is 51748366.

It is a happy number.

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 66384715 - 2¹ = 66384713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66384713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43809 + ... + 45298.

It is an arithmetic number, because the mean of its divisors is an integer number (10024650).

Almost surely, 2^66384715 is an apocalyptic number.

66384715 is a deficient number, since it is larger than the sum of its proper divisors (13812485).

66384715 is a wasteful number, since it uses less digits than its factorization.

66384715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89261.

The product of its digits is 120960, while the sum is 40.

The square root of 66384715 is about 8147.6815720793. The cubic root of 66384715 is about 404.9076962841.

The spelling of 66384715 in words is "sixty-six million, three hundred eighty-four thousand, seven hundred fifteen".