66743653 has 4 divisors (see below), whose sum is σ = 67035340. Its totient is φ = 66451968.

The previous prime is 66743647. The next prime is 66743657. The reversal of 66743653 is 35634766.

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 39212644 + 27531009 = 6262^2 + 5247^2 .

It is a cyclic number.

It is not a de Polignac number, because 66743653 - 2⁹ = 66743141 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 (66743657) 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, 145500 + ... + 145957.

It is an arithmetic number, because the mean of its divisors is an integer number (16758835).

Almost surely, 2^66743653 is an apocalyptic number.

It is an amenable number.

66743653 is a deficient number, since it is larger than the sum of its proper divisors (291687).

66743653 is a wasteful number, since it uses less digits than its factorization.

66743653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291686.

The product of its digits is 272160, while the sum is 40.

The square root of 66743653 is about 8169.6788798581. The cubic root of 66743653 is about 405.6361551392.

It can be divided in two parts, 667436 and 53, that added together give a square (667489 = 817²).

The spelling of 66743653 in words is "sixty-six million, seven hundred forty-three thousand, six hundred fifty-three".