1660776220689 has 16 divisors (see below), whose sum is σ = 2314341563520. Its totient is φ = 1057984704000.

The previous prime is 1660776220673. The next prime is 1660776220759. The reversal of 1660776220689 is 9860226770661.

It is not a de Polignac number, because 1660776220689 - 2⁴ = 1660776220673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1660776220189) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 98390437 + ... + 98407314.

It is an arithmetic number, because the mean of its divisors is an integer number (144646347720).

Almost surely, 2^{1660776220689} is an apocalyptic number.

It is an amenable number.

1660776220689 is a deficient number, since it is larger than the sum of its proper divisors (653565342831).

1660776220689 is a wasteful number, since it uses less digits than its factorization.

1660776220689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196797880.

The product of its (nonzero) digits is 18289152, while the sum is 60.

The spelling of 1660776220689 in words is "one trillion, six hundred sixty billion, seven hundred seventy-six million, two hundred twenty thousand, six hundred eighty-nine".