666040087 has 2 divisors, whose sum is σ = 666040088. Its totient is φ = 666040086.

The previous prime is 666040033. The next prime is 666040153. The reversal of 666040087 is 780040666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 666040087 - 2¹⁵ = 666007319 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666040007) 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, 333020043 + 333020044.

It is an arithmetic number, because the mean of its divisors is an integer number (333020044).

Almost surely, 2^666040087 is an apocalyptic number.

666040087 is a deficient number, since it is larger than the sum of its proper divisors (1).

666040087 is an equidigital number, since it uses as much as digits as its factorization.

666040087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 666040087 is about 25807.7524592902. The cubic root of 666040087 is about 873.3066950709.

The spelling of 666040087 in words is "six hundred sixty-six million, forty thousand, eighty-seven".