16604744811664 has 45 divisors (see below), whose sum is σ = 33954691621977. Its totient is φ = 7865258740992.

The previous prime is 16604744811661. The next prime is 16604744811673. The reversal of 16604744811664 is 46611844740661.

The square root of 16604744811664 is 4074892.

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., 16289134560400 + 315610251264 = 4035980^2 + 561792^2 .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16604744811599 and 16604744811608.

It is not an unprimeable number, because it can be changed into a prime (16604744811661) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 309664984 + ... + 309718600.

Almost surely, 2^{16604744811664} is an apocalyptic number.

16604744811664 is the 4074892-nd square number.

It is an amenable number.

16604744811664 is an abundant number, since it is smaller than the sum of its proper divisors (17349946810313).

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

16604744811664 is an frugal number, since it uses more digits than its factorization.

16604744811664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107280 (or 53638 counting only the distinct ones).

The product of its (nonzero) digits is 18579456, while the sum is 58.

The spelling of 16604744811664 in words is "sixteen trillion, six hundred four billion, seven hundred forty-four million, eight hundred eleven thousand, six hundred sixty-four".