1566654816941 has 2 divisors, whose sum is σ = 1566654816942. Its totient is φ = 1566654816940.

The previous prime is 1566654816869. The next prime is 1566654816949. The reversal of 1566654816941 is 1496184566651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1476579801316 + 90075015625 = 1215146^2 + 300125^2 .

It is a cyclic number.

It is not a de Polignac number, because 1566654816941 - 2¹⁸ = 1566654554797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1566654816949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 783327408470 + 783327408471.

It is an arithmetic number, because the mean of its divisors is an integer number (783327408471).

Almost surely, 2^{1566654816941} is an apocalyptic number.

It is an amenable number.

1566654816941 is a deficient number, since it is larger than the sum of its proper divisors (1).

1566654816941 is an equidigital number, since it uses as much as digits as its factorization.

1566654816941 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37324800, while the sum is 62.

The spelling of 1566654816941 in words is "one trillion, five hundred sixty-six billion, six hundred fifty-four million, eight hundred sixteen thousand, nine hundred forty-one".