66385879 has 4 divisors (see below), whose sum is σ = 75869584. Its totient is φ = 56902176.

The previous prime is 66385861. The next prime is 66385883. The reversal of 66385879 is 97858366.

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

It is a cyclic number.

It is not a de Polignac number, because 66385879 - 2¹⁷ = 66254807 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66385819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4741842 + ... + 4741855.

It is an arithmetic number, because the mean of its divisors is an integer number (18967396).

Almost surely, 2^66385879 is an apocalyptic number.

66385879 is a deficient number, since it is larger than the sum of its proper divisors (9483705).

66385879 is an equidigital number, since it uses as much as digits as its factorization.

66385879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9483704.

The product of its digits is 2177280, while the sum is 52.

The square root of 66385879 is about 8147.7530031291. The cubic root of 66385879 is about 404.9100628420.

The spelling of 66385879 in words is "sixty-six million, three hundred eighty-five thousand, eight hundred seventy-nine".