1566320236651 has 2 divisors, whose sum is σ = 1566320236652. Its totient is φ = 1566320236650.

The previous prime is 1566320236643. The next prime is 1566320236661.

1566320236651 is nontrivially palindromic in base 10.

It is a weak prime.

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 1566320236651 - 2³ = 1566320236643 is a prime.

It is not a weakly prime, because it can be changed into another prime (1566320236661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 783160118325 + 783160118326.

It is an arithmetic number, because the mean of its divisors is an integer number (783160118326).

Almost surely, 2^{1566320236651} is an apocalyptic number.

1566320236651 is a deficient number, since it is larger than the sum of its proper divisors (1).

1566320236651 is an equidigital number, since it uses as much as digits as its factorization.

1566320236651 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1166400, while the sum is 46.

The spelling of 1566320236651 in words is "one trillion, five hundred sixty-six billion, three hundred twenty million, two hundred thirty-six thousand, six hundred fifty-one".