66020653 has 4 divisors (see below), whose sum is σ = 66139740. Its totient is φ = 65901568.

The previous prime is 66020641. The next prime is 66020671. The reversal of 66020653 is 35602066.

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

It can be written as a sum of positive squares in 2 ways, for example, as 18507204 + 47513449 = 4302^2 + 6893^2 .

It is a cyclic number.

It is not a de Polignac number, because 66020653 - 2⁵ = 66020621 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 (66020623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58708 + ... + 59821.

It is an arithmetic number, because the mean of its divisors is an integer number (16534935).

Almost surely, 2^66020653 is an apocalyptic number.

It is an amenable number.

66020653 is a deficient number, since it is larger than the sum of its proper divisors (119087).

66020653 is a wasteful number, since it uses less digits than its factorization.

66020653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119086.

The product of its (nonzero) digits is 6480, while the sum is 28.

The square root of 66020653 is about 8125.3094094933. The cubic root of 66020653 is about 404.1661510651.

The spelling of 66020653 in words is "sixty-six million, twenty thousand, six hundred fifty-three".