66543073 has 8 divisors (see below), whose sum is σ = 70224800. Its totient is φ = 62879328.

The previous prime is 66543031. The next prime is 66543107. The reversal of 66543073 is 37034566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66543073 - 2⁹ = 66542561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66543173) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3490 + ... + 12052.

It is an arithmetic number, because the mean of its divisors is an integer number (8778100).

Almost surely, 2^66543073 is an apocalyptic number.

It is an amenable number.

66543073 is a deficient number, since it is larger than the sum of its proper divisors (3681727).

66543073 is a wasteful number, since it uses less digits than its factorization.

66543073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8991.

The product of its (nonzero) digits is 45360, while the sum is 34.

The square root of 66543073 is about 8157.3937627161. The cubic root of 66543073 is about 405.2294041498.

The spelling of 66543073 in words is "sixty-six million, five hundred forty-three thousand, seventy-three".