666728527 has 2 divisors, whose sum is σ = 666728528. Its totient is φ = 666728526.

The previous prime is 666728521. The next prime is 666728581. The reversal of 666728527 is 725827666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 666728527 - 2³ = 666728519 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 (666728521) 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, 333364263 + 333364264.

It is an arithmetic number, because the mean of its divisors is an integer number (333364264).

Almost surely, 2^666728527 is an apocalyptic number.

666728527 is a deficient number, since it is larger than the sum of its proper divisors (1).

666728527 is an equidigital number, since it uses as much as digits as its factorization.

666728527 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1693440, while the sum is 49.

The square root of 666728527 is about 25821.0868671325. The cubic root of 666728527 is about 873.6074838900.

The spelling of 666728527 in words is "six hundred sixty-six million, seven hundred twenty-eight thousand, five hundred twenty-seven".