1566123313 has 2 divisors, whose sum is σ = 1566123314. Its totient is φ = 1566123312.

The previous prime is 1566123311. The next prime is 1566123319. The reversal of 1566123313 is 3133216651.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1020994209 + 545129104 = 31953^2 + 23348^2 .

It is a cyclic number.

It is not a de Polignac number, because 1566123313 - 2¹ = 1566123311 is a prime.

Together with 1566123311, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1566123311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 783061656 + 783061657.

It is an arithmetic number, because the mean of its divisors is an integer number (783061657).

Almost surely, 2^1566123313 is an apocalyptic number.

It is an amenable number.

1566123313 is a deficient number, since it is larger than the sum of its proper divisors (1).

1566123313 is an equidigital number, since it uses as much as digits as its factorization.

1566123313 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9720, while the sum is 31.

The square root of 1566123313 is about 39574.2758998822. The cubic root of 1566123313 is about 1161.2934721936.

Adding to 1566123313 its reverse (3133216651), we get a palindrome (4699339964).

The spelling of 1566123313 in words is "one billion, five hundred sixty-six million, one hundred twenty-three thousand, three hundred thirteen".