66830573 has 4 divisors (see below), whose sum is σ = 67422108. Its totient is φ = 66239040.

The previous prime is 66830549. The next prime is 66830591. The reversal of 66830573 is 37503866.

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 5396329 + 61434244 = 2323^2 + 7838^2 .

It is a cyclic number.

It is not a de Polignac number, because 66830573 - 2⁸ = 66830317 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 (66830503) 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, 295598 + ... + 295823.

It is an arithmetic number, because the mean of its divisors is an integer number (16855527).

Almost surely, 2^66830573 is an apocalyptic number.

It is an amenable number.

66830573 is a deficient number, since it is larger than the sum of its proper divisors (591535).

66830573 is a wasteful number, since it uses less digits than its factorization.

66830573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 591534.

The product of its (nonzero) digits is 90720, while the sum is 38.

The square root of 66830573 is about 8174.9968195712. The cubic root of 66830573 is about 405.8121648853.

The spelling of 66830573 in words is "sixty-six million, eight hundred thirty thousand, five hundred seventy-three".