66396679 has 4 divisors (see below), whose sum is σ = 70302384. Its totient is φ = 62490976.

The previous prime is 66396643. The next prime is 66396719. The reversal of 66396679 is 97669366.

66396679 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 66396679 - 2¹⁵ = 66363911 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66396619) 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 3 ways as a sum of consecutive naturals, for example, 1952827 + ... + 1952860.

It is an arithmetic number, because the mean of its divisors is an integer number (17575596).

Almost surely, 2^66396679 is an apocalyptic number.

66396679 is a deficient number, since it is larger than the sum of its proper divisors (3905705).

66396679 is a wasteful number, since it uses less digits than its factorization.

66396679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3905704.

The product of its digits is 2204496, while the sum is 52.

The square root of 66396679 is about 8148.4157355893. The cubic root of 66396679 is about 404.9320192762.

The spelling of 66396679 in words is "sixty-six million, three hundred ninety-six thousand, six hundred seventy-nine".