1660564398644 has 12 divisors (see below), whose sum is σ = 2960817654564. Its totient is φ = 814616497344.

The previous prime is 1660564398629. The next prime is 1660564398709. The reversal of 1660564398644 is 4468934650661.

It can be written as a sum of positive squares in 2 ways, for example, as 1299002708644 + 361561690000 = 1139738^2 + 601300^2 .

It is a hoax number, since the sum of its digits (62) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3916425257 + ... + 3916425680.

It is an arithmetic number, because the mean of its divisors is an integer number (246734804547).

Almost surely, 2^{1660564398644} is an apocalyptic number.

It is an amenable number.

1660564398644 is a deficient number, since it is larger than the sum of its proper divisors (1300253255920).

1660564398644 is a wasteful number, since it uses less digits than its factorization.

1660564398644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7832850994 (or 7832850992 counting only the distinct ones).

The product of its (nonzero) digits is 89579520, while the sum is 62.

The spelling of 1660564398644 in words is "one trillion, six hundred sixty billion, five hundred sixty-four million, three hundred ninety-eight thousand, six hundred forty-four".