666488539 has 2 divisors, whose sum is σ = 666488540. Its totient is φ = 666488538.

The previous prime is 666488533. The next prime is 666488609. The reversal of 666488539 is 935884666.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 666488539 - 2³ = 666488531 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 666488539.

It is not a weakly prime, because it can be changed into another prime (666488531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333244269 + 333244270.

It is an arithmetic number, because the mean of its divisors is an integer number (333244270).

Almost surely, 2^666488539 is an apocalyptic number.

666488539 is a deficient number, since it is larger than the sum of its proper divisors (1).

666488539 is an equidigital number, since it uses as much as digits as its factorization.

666488539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7464960, while the sum is 55.

The square root of 666488539 is about 25816.4393168384. The cubic root of 666488539 is about 873.5026533808.

The spelling of 666488539 in words is "six hundred sixty-six million, four hundred eighty-eight thousand, five hundred thirty-nine".