669366149904 has 135 divisors (see below), whose sum is σ = 1940944987189. Its totient is φ = 215336553600.

The previous prime is 669366149873. The next prime is 669366149957. The reversal of 669366149904 is 409941663966.

The square root of 669366149904 is 818148.

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

669366149904 is a `hidden beast` number, since 6 + 6 + 9 + 3 + 6 + 614 + 9 + 9 + 0 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 350999372304 + 318366777600 = 592452^2 + 564240^2 .

It is a Duffinian number.

It is an unprimeable number.

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 26 ways as a sum of consecutive naturals, for example, 284714329 + ... + 284716679.

Almost surely, 2^669366149904 is an apocalyptic number.

669366149904 is the 818148-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 669366149904

669366149904 is an abundant number, since it is smaller than the sum of its proper divisors (1271578837285).

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

669366149904 is an equidigital number, since it uses as much as digits as its factorization.

669366149904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4774 (or 2385 counting only the distinct ones).

The product of its (nonzero) digits is 45349632, while the sum is 63.

The spelling of 669366149904 in words is "six hundred sixty-nine billion, three hundred sixty-six million, one hundred forty-nine thousand, nine hundred four".