669008196 has 18 divisors (see below), whose sum is σ = 1691104142. Its totient is φ = 223002720.

The previous prime is 669008177. The next prime is 669008201. The reversal of 669008196 is 691800966.

It can be written as a sum of positive squares in only one way, i.e., 461648196 + 207360000 = 21486^2 + 14400^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9291745 + ... + 9291816.

Almost surely, 2^669008196 is an apocalyptic number.

It is an amenable number.

669008196 is an abundant number, since it is smaller than the sum of its proper divisors (1022095946).

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

669008196 is a wasteful number, since it uses less digits than its factorization.

669008196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18583571 (or 18583566 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 669008196 is about 25865.1927501034. The cubic root of 669008196 is about 874.6020268010.

The spelling of 669008196 in words is "six hundred sixty-nine million, eight thousand, one hundred ninety-six".