1660712820653 has 2 divisors, whose sum is σ = 1660712820654. Its totient is φ = 1660712820652.

The previous prime is 1660712820623. The next prime is 1660712820659. The reversal of 1660712820653 is 3560282170661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1630185043369 + 30527777284 = 1276787^2 + 174722^2 .

It is an emirp because it is prime and its reverse (3560282170661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1660712820653 - 2¹⁰ = 1660712819629 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1660712820598 and 1660712820607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1660712820659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830356410326 + 830356410327.

It is an arithmetic number, because the mean of its divisors is an integer number (830356410327).

Almost surely, 2^{1660712820653} is an apocalyptic number.

It is an amenable number.

1660712820653 is a deficient number, since it is larger than the sum of its proper divisors (1).

1660712820653 is an equidigital number, since it uses as much as digits as its factorization.

1660712820653 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 725760, while the sum is 47.

The spelling of 1660712820653 in words is "one trillion, six hundred sixty billion, seven hundred twelve million, eight hundred twenty thousand, six hundred fifty-three".