66580543 has 2 divisors, whose sum is σ = 66580544. Its totient is φ = 66580542.

The previous prime is 66580537. The next prime is 66580567. The reversal of 66580543 is 34508566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66580543 - 2²⁵ = 33026111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66580573) 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, 33290271 + 33290272.

It is an arithmetic number, because the mean of its divisors is an integer number (33290272).

Almost surely, 2^66580543 is an apocalyptic number.

66580543 is a deficient number, since it is larger than the sum of its proper divisors (1).

66580543 is an equidigital number, since it uses as much as digits as its factorization.

66580543 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 86400, while the sum is 37.

The square root of 66580543 is about 8159.6901289203. The cubic root of 66580543 is about 405.3054506161.

The spelling of 66580543 in words is "sixty-six million, five hundred eighty thousand, five hundred forty-three".