66530999 has 2 divisors, whose sum is σ = 66531000. Its totient is φ = 66530998.

The previous prime is 66530993. The next prime is 66531011. The reversal of 66530999 is 99903566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66530999 - 2⁴ = 66530983 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66530993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33265499 + 33265500.

It is an arithmetic number, because the mean of its divisors is an integer number (33265500).

Almost surely, 2^66530999 is an apocalyptic number.

66530999 is a deficient number, since it is larger than the sum of its proper divisors (1).

66530999 is an equidigital number, since it uses as much as digits as its factorization.

66530999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 393660, while the sum is 47.

The square root of 66530999 is about 8156.6536643405. The cubic root of 66530999 is about 405.2048935306.

The spelling of 66530999 in words is "sixty-six million, five hundred thirty thousand, nine hundred ninety-nine".