668984197 has 4 divisors (see below), whose sum is σ = 764553376. Its totient is φ = 573415020.

The previous prime is 668984177. The next prime is 668984207. The reversal of 668984197 is 791489866.

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 not a de Polignac number, because 668984197 - 2¹⁵ = 668951429 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 (668984117) 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, 47784579 + ... + 47784592.

It is an arithmetic number, because the mean of its divisors is an integer number (191138344).

Almost surely, 2^668984197 is an apocalyptic number.

It is an amenable number.

668984197 is a deficient number, since it is larger than the sum of its proper divisors (95569179).

668984197 is an equidigital number, since it uses as much as digits as its factorization.

668984197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95569178.

The product of its digits is 5225472, while the sum is 58.

The square root of 668984197 is about 25864.7288213119. The cubic root of 668984197 is about 874.5915686207.

The spelling of 668984197 in words is "six hundred sixty-eight million, nine hundred eighty-four thousand, one hundred ninety-seven".