66391301 has 4 divisors (see below), whose sum is σ = 69885600. Its totient is φ = 62897004.

The previous prime is 66391291. The next prime is 66391309. The reversal of 66391301 is 10319366.

66391301 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, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10319366 = 2 ⋅5159683.

It is a cyclic number.

It is not a de Polignac number, because 66391301 - 2¹⁰ = 66390277 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 (66391309) 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, 1747121 + ... + 1747158.

It is an arithmetic number, because the mean of its divisors is an integer number (17471400).

Almost surely, 2^66391301 is an apocalyptic number.

It is an amenable number.

66391301 is a deficient number, since it is larger than the sum of its proper divisors (3494299).

66391301 is a wasteful number, since it uses less digits than its factorization.

66391301 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3494298.

The product of its (nonzero) digits is 2916, while the sum is 29.

The square root of 66391301 is about 8148.0857261077. The cubic root of 66391301 is about 404.9210860828.

The spelling of 66391301 in words is "sixty-six million, three hundred ninety-one thousand, three hundred one".