669646373 has 8 divisors (see below), whose sum is σ = 731573856. Its totient is φ = 607894000.

The previous prime is 669646321. The next prime is 669646381. The reversal of 669646373 is 373646966.

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 669646373 - 2⁶ = 669646309 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 (669646673) 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, 35711 + ... + 51132.

It is an arithmetic number, because the mean of its divisors is an integer number (91446732).

Almost surely, 2^669646373 is an apocalyptic number.

It is an amenable number.

669646373 is a deficient number, since it is larger than the sum of its proper divisors (61927483).

669646373 is a wasteful number, since it uses less digits than its factorization.

669646373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87555.

The product of its digits is 2939328, while the sum is 50.

The square root of 669646373 is about 25877.5264080630. The cubic root of 669646373 is about 874.8800371048.

It can be divided in two parts, 66964 and 6373, that added together give a palindrome (73337).

The spelling of 669646373 in words is "six hundred sixty-nine million, six hundred forty-six thousand, three hundred seventy-three".