669254886400 has 99 divisors (see below), whose sum is σ = 1659266211531. Its totient is φ = 267649597440.

The previous prime is 669254886373. The next prime is 669254886451. The reversal of 669254886400 is 4688452966.

The square root of 669254886400 is 818080.

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

It can be written as a sum of positive squares in 4 ways, for example, as 363348550656 + 305906335744 = 602784^2 + 553088^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 130890244 + ... + 130895356.

Almost surely, 2^669254886400 is an apocalyptic number.

669254886400 is the 818080-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 669254886400

669254886400 is an abundant number, since it is smaller than the sum of its proper divisors (990011325131).

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

669254886400 is an frugal number, since it uses more digits than its factorization.

669254886400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10256 (or 5120 counting only the distinct ones).

The product of its (nonzero) digits is 19906560, while the sum is 58.

The spelling of 669254886400 in words is "six hundred sixty-nine billion, two hundred fifty-four million, eight hundred eighty-six thousand, four hundred".