669497059984 has 15 divisors (see below), whose sum is σ = 1297156895017. Its totient is φ = 334746893536.

The previous prime is 669497059969. The next prime is 669497059997. The reversal of 669497059984 is 489950794966.

It is a happy number.

The square root of 669497059984 is 818228.

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

It can be written as a sum of positive squares in only one way, i.e., 654448640400 + 15048419584 = 808980^2 + 122672^2 .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 669497059984.

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 2 ways as a sum of consecutive naturals, for example, 3170634 + ... + 3375190.

Almost surely, 2^669497059984 is an apocalyptic number.

669497059984 is the 818228-th square number.

It is an amenable number.

669497059984 is a deficient number, since it is larger than the sum of its proper divisors (627659835033).

669497059984 is an frugal number, since it uses more digits than its factorization.

669497059984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409122 (or 204559 counting only the distinct ones).

The product of its (nonzero) digits is 1058158080, while the sum is 76.

The spelling of 669497059984 in words is "six hundred sixty-nine billion, four hundred ninety-seven million, fifty-nine thousand, nine hundred eighty-four".