66660573 has 8 divisors (see below), whose sum is σ = 101578048. Its totient is φ = 38091744.

The previous prime is 66660563. The next prime is 66660613. The reversal of 66660573 is 37506666.

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

It is not a de Polignac number, because 66660573 - 2⁵ = 66660541 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66660563) 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, 1587136 + ... + 1587177.

It is an arithmetic number, because the mean of its divisors is an integer number (12697256).

Almost surely, 2^66660573 is an apocalyptic number.

It is an amenable number.

66660573 is a deficient number, since it is larger than the sum of its proper divisors (34917475).

66660573 is a wasteful number, since it uses less digits than its factorization.

66660573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3174323.

The product of its (nonzero) digits is 136080, while the sum is 39.

The square root of 66660573 is about 8164.5926413998. The cubic root of 66660573 is about 405.4677783579.

The spelling of 66660573 in words is "sixty-six million, six hundred sixty thousand, five hundred seventy-three".