1265566013 has 2 divisors, whose sum is σ = 1265566014. Its totient is φ = 1265566012.

The previous prime is 1265565943. The next prime is 1265566031. The reversal of 1265566013 is 3106655621.

Together with next prime (1265566031) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1264371364 + 1194649 = 35558^2 + 1093^2 .

It is an emirp because it is prime and its reverse (3106655621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1265566013 - 2¹² = 1265561917 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 (1265566063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632783006 + 632783007.

It is an arithmetic number, because the mean of its divisors is an integer number (632783007).

Almost surely, 2^1265566013 is an apocalyptic number.

It is an amenable number.

1265566013 is a deficient number, since it is larger than the sum of its proper divisors (1).

1265566013 is an equidigital number, since it uses as much as digits as its factorization.

1265566013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 1265566013 is about 35574.7946304684. The cubic root of 1265566013 is about 1081.6703727336.

The spelling of 1265566013 in words is "one billion, two hundred sixty-five million, five hundred sixty-six thousand, thirteen".