668669039 has 8 divisors (see below), whose sum is σ = 690972672. Its totient is φ = 646411320.

The previous prime is 668669011. The next prime is 668669051. The reversal of 668669039 is 930966866.

It is a happy number.

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 668669039 - 2¹² = 668664943 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 (668639039) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19502 + ... + 41444.

It is an arithmetic number, because the mean of its divisors is an integer number (86371584).

Almost surely, 2^668669039 is an apocalyptic number.

668669039 is a deficient number, since it is larger than the sum of its proper divisors (22303633).

668669039 is a wasteful number, since it uses less digits than its factorization.

668669039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22957.

The product of its (nonzero) digits is 2519424, while the sum is 53.

The square root of 668669039 is about 25858.6356755340. The cubic root of 668669039 is about 874.4542072172.

The spelling of 668669039 in words is "six hundred sixty-eight million, six hundred sixty-nine thousand, thirty-nine".