666329593 has 8 divisors (see below), whose sum is σ = 688125440. Its totient is φ = 644552640.

The previous prime is 666329551. The next prime is 666329597. The reversal of 666329593 is 395923666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 666329593 - 2¹⁷ = 666198521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666329597) 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 7 ways as a sum of consecutive naturals, for example, 117796 + ... + 123322.

It is an arithmetic number, because the mean of its divisors is an integer number (86015680).

Almost surely, 2^666329593 is an apocalyptic number.

It is an amenable number.

666329593 is a deficient number, since it is larger than the sum of its proper divisors (21795847).

666329593 is a wasteful number, since it uses less digits than its factorization.

666329593 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9447.

The product of its digits is 1574640, while the sum is 49.

The square root of 666329593 is about 25813.3607459393. The cubic root of 666329593 is about 873.4332094304.

The spelling of 666329593 in words is "six hundred sixty-six million, three hundred twenty-nine thousand, five hundred ninety-three".