66530 has 8 divisors (see below), whose sum is σ = 119772. Its totient is φ = 26608.

The previous prime is 66529. The next prime is 66533. The reversal of 66530 is 3566.

It can be written as a sum of positive squares in 2 ways, for example, as 57121 + 9409 = 239^2 + 97^2 .

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

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (66533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3317 + ... + 3336.

2⁶⁶⁵³⁰ is an apocalyptic number.

66530 is a deficient number, since it is larger than the sum of its proper divisors (53242).

66530 is a wasteful number, since it uses less digits than its factorization.

66530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6660.

The product of its (nonzero) digits is 540, while the sum is 20.

The square root of 66530 is about 257.9341001109. The cubic root of 66530 is about 40.5202865395.

It can be divided in two parts, 66 and 530, that multiplied together give a triangular number (34980 = T₂₆₄).

The spelling of 66530 in words is "sixty-six thousand, five hundred thirty".