19604456446864 has 15 divisors (see below), whose sum is σ = 37983668680443. Its totient is φ = 9802219368048.

The previous prime is 19604456446759. The next prime is 19604456446867. The reversal of 19604456446864 is 46864465440691.

The square root of 19604456446864 is 4427692.

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

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 19604456446864.

It is not an unprimeable number, because it can be changed into a prime (19604456446867) by changing a digit.

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 2 ways as a sum of consecutive naturals, for example, 17157307 + ... + 18264229.

Almost surely, 2^{19604456446864} is an apocalyptic number.

19604456446864 is the 4427692-nd square number.

It is an amenable number.

19604456446864 is a deficient number, since it is larger than the sum of its proper divisors (18379212233579).

19604456446864 is an frugal number, since it uses more digits than its factorization.

19604456446864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2213854 (or 1106925 counting only the distinct ones).

The product of its (nonzero) digits is 477757440, while the sum is 67.

The spelling of 19604456446864 in words is "nineteen trillion, six hundred four billion, four hundred fifty-six million, four hundred forty-six thousand, eight hundred sixty-four".