669696722500 has 135 divisors (see below), whose sum is σ = 1587072303201. Its totient is φ = 247076232000.

The previous prime is 669696722489. The next prime is 669696722521. The reversal of 669696722500 is 5227696966.

The square root of 669696722500 is 818350.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 7 ways, for example, as 661479662596 + 8217059904 = 813314^2 + 90648^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 531926871 + ... + 531928129.

Almost surely, 2^669696722500 is an apocalyptic number.

669696722500 is the 818350-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 669696722500

669696722500 is an abundant number, since it is smaller than the sum of its proper divisors (917375580701).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

669696722500 is an equidigital number, since it uses as much as digits as its factorization.

669696722500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2568 (or 1279 counting only the distinct ones).

The product of its (nonzero) digits is 14696640, while the sum is 58.

The spelling of 669696722500 in words is "six hundred sixty-nine billion, six hundred ninety-six million, seven hundred twenty-two thousand, five hundred".