1998570309264 has 45 divisors (see below), whose sum is σ = 5593268551273. Its totient is φ = 666184448256.

The previous prime is 1998570309199. The next prime is 1998570309271. The reversal of 1998570309264 is 4629030758991.

The square root of 1998570309264 is 1413708.

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

1998570309264 is a `hidden beast` number, since 1 + 9 + 9 + 8 + 570 + 30 + 9 + 26 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1851482718864 + 147087590400 = 1360692^2 + 383520^2 .

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, 16905592 + ... + 17023400.

It is a 2-persistent number, because it is pandigital, and so is 2⋅1998570309264 = 3997140618528, but 3⋅1998570309264 = 5995710927792 is not.

Almost surely, 2^{1998570309264} is an apocalyptic number.

1998570309264 is the 1413708-th square number.

It is an amenable number.

1998570309264 is an abundant number, since it is smaller than the sum of its proper divisors (3594698242009).

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

1998570309264 is an frugal number, since it uses more digits than its factorization.

1998570309264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235632 (or 117814 counting only the distinct ones).

The product of its (nonzero) digits is 29393280, while the sum is 63.

The spelling of 1998570309264 in words is "one trillion, nine hundred ninety-eight billion, five hundred seventy million, three hundred nine thousand, two hundred sixty-four".