666384715 has 8 divisors (see below), whose sum is σ = 800100288. Its totient is φ = 532815360.

The previous prime is 666384713. The next prime is 666384731. The reversal of 666384715 is 517483666.

666384715 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 666384715 - 2¹ = 666384713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666384713) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26262 + ... + 44971.

It is an arithmetic number, because the mean of its divisors is an integer number (100012536).

Almost surely, 2^666384715 is an apocalyptic number.

666384715 is a deficient number, since it is larger than the sum of its proper divisors (133715573).

666384715 is a wasteful number, since it uses less digits than its factorization.

666384715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73109.

The product of its digits is 725760, while the sum is 46.

The square root of 666384715 is about 25814.4284267539. The cubic root of 666384715 is about 873.4572936365.

It can be divided in two parts, 6663 and 84715, that added together give a triangular number (91378 = T₄₂₇).

The spelling of 666384715 in words is "six hundred sixty-six million, three hundred eighty-four thousand, seven hundred fifteen".