1665078713 has 2 divisors, whose sum is σ = 1665078714. Its totient is φ = 1665078712.

The previous prime is 1665078697. The next prime is 1665078769. The reversal of 1665078713 is 3178705661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1260747049 + 404331664 = 35507^2 + 20108^2 .

It is a cyclic number.

It is not a de Polignac number, because 1665078713 - 2⁴ = 1665078697 is a prime.

It is not a weakly prime, because it can be changed into another prime (1665071713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832539356 + 832539357.

It is an arithmetic number, because the mean of its divisors is an integer number (832539357).

Almost surely, 2^1665078713 is an apocalyptic number.

It is an amenable number.

1665078713 is a deficient number, since it is larger than the sum of its proper divisors (1).

1665078713 is an equidigital number, since it uses as much as digits as its factorization.

1665078713 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 211680, while the sum is 44.

The square root of 1665078713 is about 40805.3760306164. The cubic root of 1665078713 is about 1185.2544363950.

The spelling of 1665078713 in words is "one billion, six hundred sixty-five million, seventy-eight thousand, seven hundred thirteen".