1566243113 has 2 divisors, whose sum is σ = 1566243114. Its totient is φ = 1566243112.

The previous prime is 1566243109. The next prime is 1566243157. The reversal of 1566243113 is 3113426651.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1175666944 + 390576169 = 34288^2 + 19763^2 .

It is a cyclic number.

It is not a de Polignac number, because 1566243113 - 2² = 1566243109 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1566243113.

It is not a weakly prime, because it can be changed into another prime (1566243193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 783121556 + 783121557.

It is an arithmetic number, because the mean of its divisors is an integer number (783121557).

Almost surely, 2^1566243113 is an apocalyptic number.

It is an amenable number.

1566243113 is a deficient number, since it is larger than the sum of its proper divisors (1).

1566243113 is an equidigital number, since it uses as much as digits as its factorization.

1566243113 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 32.

The square root of 1566243113 is about 39575.7894804387. The cubic root of 1566243113 is about 1161.3230823377.

Adding to 1566243113 its reverse (3113426651), we get a palindrome (4679669764).

The spelling of 1566243113 in words is "one billion, five hundred sixty-six million, two hundred forty-three thousand, one hundred thirteen".