1566343162661 has 2 divisors, whose sum is σ = 1566343162662. Its totient is φ = 1566343162660.

The previous prime is 1566343162541. The next prime is 1566343162753. The reversal of 1566343162661 is 1662613436651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1548170505025 + 18172657636 = 1244255^2 + 134806^2 .

It is an emirp because it is prime and its reverse (1662613436651) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1566343162661 - 2²² = 1566338968357 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1566343102661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 783171581330 + 783171581331.

It is an arithmetic number, because the mean of its divisors is an integer number (783171581331).

Almost surely, 2^{1566343162661} is an apocalyptic number.

It is an amenable number.

1566343162661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1566343162661 is an equidigital number, since it uses as much as digits as its factorization.

1566343162661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2799360, while the sum is 50.

The spelling of 1566343162661 in words is "one trillion, five hundred sixty-six billion, three hundred forty-three million, one hundred sixty-two thousand, six hundred sixty-one".