66581327 has 2 divisors, whose sum is σ = 66581328. Its totient is φ = 66581326.

The previous prime is 66581309. The next prime is 66581341. The reversal of 66581327 is 72318566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66581327 - 2¹⁴ = 66564943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66581357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33290663 + 33290664.

It is an arithmetic number, because the mean of its divisors is an integer number (33290664).

Almost surely, 2^66581327 is an apocalyptic number.

66581327 is a deficient number, since it is larger than the sum of its proper divisors (1).

66581327 is an equidigital number, since it uses as much as digits as its factorization.

66581327 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 38.

The square root of 66581327 is about 8159.7381698189. The cubic root of 66581327 is about 405.3070414623.

The spelling of 66581327 in words is "sixty-six million, five hundred eighty-one thousand, three hundred twenty-seven".