66556583 has 2 divisors, whose sum is σ = 66556584. Its totient is φ = 66556582.

The previous prime is 66556579. The next prime is 66556613. The reversal of 66556583 is 38565566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66556583 - 2² = 66556579 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 (66556573) 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 as a sum of consecutive naturals, namely, 33278291 + 33278292.

It is an arithmetic number, because the mean of its divisors is an integer number (33278292).

Almost surely, 2^66556583 is an apocalyptic number.

66556583 is a deficient number, since it is larger than the sum of its proper divisors (1).

66556583 is an equidigital number, since it uses as much as digits as its factorization.

66556583 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648000, while the sum is 44.

The square root of 66556583 is about 8158.2218038001. The cubic root of 66556583 is about 405.2568263820.

The spelling of 66556583 in words is "sixty-six million, five hundred fifty-six thousand, five hundred eighty-three".