999664028224 has 21 divisors (see below), whose sum is σ = 1983724178467. Its totient is φ = 499828014784.

The previous prime is 999664028219. The next prime is 999664028291. The reversal of 999664028224 is 422820466999.

The square root of 999664028224 is 999832.

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

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 7936167 + ... + 8061145.

Almost surely, 2^999664028224 is an apocalyptic number.

999664028224 is the 999832-nd square number.

It is an amenable number.

999664028224 is a deficient number, since it is larger than the sum of its proper divisors (984060150243).

999664028224 is an frugal number, since it uses more digits than its factorization.

999664028224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249970 (or 124981 counting only the distinct ones).

The product of its (nonzero) digits is 26873856, while the sum is 61.

The spelling of 999664028224 in words is "nine hundred ninety-nine billion, six hundred sixty-four million, twenty-eight thousand, two hundred twenty-four".