66206743 has 4 divisors (see below), whose sum is σ = 66628600. Its totient is φ = 65784888.

The previous prime is 66206741. The next prime is 66206747. The reversal of 66206743 is 34760266.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34760266 = 2 ⋅17380133.

It is a cyclic number.

It is not a de Polignac number, because 66206743 - 2¹ = 66206741 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66206699 and 66206708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66206741) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210693 + ... + 211006.

It is an arithmetic number, because the mean of its divisors is an integer number (16657150).

Almost surely, 2^66206743 is an apocalyptic number.

66206743 is a deficient number, since it is larger than the sum of its proper divisors (421857).

66206743 is a wasteful number, since it uses less digits than its factorization.

66206743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421856.

The product of its (nonzero) digits is 36288, while the sum is 34.

The square root of 66206743 is about 8136.7526077668. The cubic root of 66206743 is about 404.5455309561.

The spelling of 66206743 in words is "sixty-six million, two hundred six thousand, seven hundred forty-three".