1663266613 has 2 divisors, whose sum is σ = 1663266614. Its totient is φ = 1663266612.

The previous prime is 1663266607. The next prime is 1663266623. The reversal of 1663266613 is 3166623661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1418124964 + 245141649 = 37658^2 + 15657^2 .

It is a cyclic number.

It is not a de Polignac number, because 1663266613 - 2²⁹ = 1126395701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1663266623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 831633306 + 831633307.

It is an arithmetic number, because the mean of its divisors is an integer number (831633307).

Almost surely, 2^1663266613 is an apocalyptic number.

It is an amenable number.

1663266613 is a deficient number, since it is larger than the sum of its proper divisors (1).

1663266613 is an equidigital number, since it uses as much as digits as its factorization.

1663266613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 139968, while the sum is 40.

The square root of 1663266613 is about 40783.1658040422. The cubic root of 1663266613 is about 1184.8243107466.

The spelling of 1663266613 in words is "one billion, six hundred sixty-three million, two hundred sixty-six thousand, six hundred thirteen".