66478315 has 4 divisors (see below), whose sum is σ = 79773984. Its totient is φ = 53182648.

The previous prime is 66478297. The next prime is 66478333. The reversal of 66478315 is 51387466.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (66478297) and next prime (66478333).

It is a cyclic number.

It is not a de Polignac number, because 66478315 - 2¹⁹ = 65954027 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6647827 + ... + 6647836.

It is an arithmetic number, because the mean of its divisors is an integer number (19943496).

Almost surely, 2^66478315 is an apocalyptic number.

66478315 is a deficient number, since it is larger than the sum of its proper divisors (13295669).

66478315 is a wasteful number, since it uses less digits than its factorization.

66478315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13295668.

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

The square root of 66478315 is about 8153.4235140829. The cubic root of 66478315 is about 405.0979085545.

The spelling of 66478315 in words is "sixty-six million, four hundred seventy-eight thousand, three hundred fifteen".