666733399 has 8 divisors (see below), whose sum is σ = 702885888. Its totient is φ = 631496280.

The previous prime is 666733393. The next prime is 666733409. The reversal of 666733399 is 993337666.

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 666733399 - 2³ = 666733391 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 (666733391) 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, 227347 + ... + 230260.

It is an arithmetic number, because the mean of its divisors is an integer number (87860736).

Almost surely, 2^666733399 is an apocalyptic number.

666733399 is a deficient number, since it is larger than the sum of its proper divisors (36152489).

666733399 is a wasteful number, since it uses less digits than its factorization.

666733399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457685.

The product of its digits is 3306744, while the sum is 52.

The square root of 666733399 is about 25821.1812084575. The cubic root of 666733399 is about 873.6096117952.

The spelling of 666733399 in words is "six hundred sixty-six million, seven hundred thirty-three thousand, three hundred ninety-nine".