666488593 has 4 divisors (see below), whose sum is σ = 701566960. Its totient is φ = 631410228.

The previous prime is 666488539. The next prime is 666488609. The reversal of 666488593 is 395884666.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666488593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666488533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17539155 + ... + 17539192.

It is an arithmetic number, because the mean of its divisors is an integer number (175391740).

Almost surely, 2^666488593 is an apocalyptic number.

It is an amenable number.

666488593 is a deficient number, since it is larger than the sum of its proper divisors (35078367).

666488593 is a wasteful number, since it uses less digits than its factorization.

666488593 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35078366.

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

The square root of 666488593 is about 25816.4403626836. The cubic root of 666488593 is about 873.5026769717.

The spelling of 666488593 in words is "six hundred sixty-six million, four hundred eighty-eight thousand, five hundred ninety-three".