6661560660769 has 16 divisors (see below), whose sum is σ = 8174584094976. Its totient is φ = 5298341529600.

The previous prime is 6661560660739. The next prime is 6661560660779. The reversal of 6661560660769 is 9670660651666.

It is not a de Polignac number, because 6661560660769 - 2⁵ = 6661560660737 is a prime.

It is a super-2 number, since 2×6661560660769² (a number of 26 digits) contains 22 as substring.

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 6661560660769.

It is not an unprimeable number, because it can be changed into a prime (6661560660709) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 394213392 + ... + 394230289.

It is an arithmetic number, because the mean of its divisors is an integer number (510911505936).

Almost surely, 2^{6661560660769} is an apocalyptic number.

It is an amenable number.

6661560660769 is a deficient number, since it is larger than the sum of its proper divisors (1513023434207).

6661560660769 is a wasteful number, since it uses less digits than its factorization.

6661560660769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 788443776.

The product of its (nonzero) digits is 88179840, while the sum is 64.

The spelling of 6661560660769 in words is "six trillion, six hundred sixty-one billion, five hundred sixty million, six hundred sixty thousand, seven hundred sixty-nine".