66379817 has 16 divisors (see below), whose sum is σ = 80289792. Its totient is φ = 53647440.

The previous prime is 66379799. The next prime is 66379843. The reversal of 66379817 is 71897366.

66379817 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 66379817 - 2²⁴ = 49602601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66379877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8528 + ... + 14334.

It is an arithmetic number, because the mean of its divisors is an integer number (5018112).

Almost surely, 2^66379817 is an apocalyptic number.

It is an amenable number.

66379817 is a deficient number, since it is larger than the sum of its proper divisors (13909975).

66379817 is a wasteful number, since it uses less digits than its factorization.

66379817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5908.

The product of its digits is 381024, while the sum is 47.

The square root of 66379817 is about 8147.3809902324. The cubic root of 66379817 is about 404.8977377333.

The spelling of 66379817 in words is "sixty-six million, three hundred seventy-nine thousand, eight hundred seventeen".