666005759 has 4 divisors (see below), whose sum is σ = 666087816. Its totient is φ = 665923704.

The previous prime is 666005729. The next prime is 666005761. The reversal of 666005759 is 957500666.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 666005759 - 2²⁴ = 649228543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666005729) 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 in 3 ways as a sum of consecutive naturals, for example, 27329 + ... + 45594.

It is an arithmetic number, because the mean of its divisors is an integer number (166521954).

Almost surely, 2^666005759 is an apocalyptic number.

666005759 is a deficient number, since it is larger than the sum of its proper divisors (82057).

666005759 is an equidigital number, since it uses as much as digits as its factorization.

666005759 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82056.

The product of its (nonzero) digits is 340200, while the sum is 44.

The square root of 666005759 is about 25807.0873792453. The cubic root of 666005759 is about 873.2916912757.

The spelling of 666005759 in words is "six hundred sixty-six million, five thousand, seven hundred fifty-nine".