66371065 has 4 divisors (see below), whose sum is σ = 79645284. Its totient is φ = 53096848.

The previous prime is 66371057. The next prime is 66371083. The reversal of 66371065 is 56017366.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56017366 = 2 ⋅28008683.

It can be written as a sum of positive squares in 2 ways, for example, as 7634169 + 58736896 = 2763^2 + 7664^2 .

It is a cyclic number.

It is not a de Polignac number, because 66371065 - 2³ = 66371057 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66371065.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6637102 + ... + 6637111.

It is an arithmetic number, because the mean of its divisors is an integer number (19911321).

Almost surely, 2^66371065 is an apocalyptic number.

It is an amenable number.

66371065 is a deficient number, since it is larger than the sum of its proper divisors (13274219).

66371065 is a wasteful number, since it uses less digits than its factorization.

66371065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13274218.

The product of its (nonzero) digits is 22680, while the sum is 34.

The square root of 66371065 is about 8146.8438674127. The cubic root of 66371065 is about 404.8799420593.

The spelling of 66371065 in words is "sixty-six million, three hundred seventy-one thousand, sixty-five".