1560390216661 has 2 divisors, whose sum is σ = 1560390216662. Its totient is φ = 1560390216660.

The previous prime is 1560390216643. The next prime is 1560390216689. The reversal of 1560390216661 is 1666120930651.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1305283400100 + 255106816561 = 1142490^2 + 505081^2 .

It is a cyclic number.

It is not a de Polignac number, because 1560390216661 - 2¹¹ = 1560390214613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1560390216641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 780195108330 + 780195108331.

It is an arithmetic number, because the mean of its divisors is an integer number (780195108331).

Almost surely, 2^{1560390216661} is an apocalyptic number.

It is an amenable number.

1560390216661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1560390216661 is an equidigital number, since it uses as much as digits as its factorization.

1560390216661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 349920, while the sum is 46.

The spelling of 1560390216661 in words is "one trillion, five hundred sixty billion, three hundred ninety million, two hundred sixteen thousand, six hundred sixty-one".