1273505663 has 2 divisors, whose sum is σ = 1273505664. Its totient is φ = 1273505662.

The previous prime is 1273505599. The next prime is 1273505669. The reversal of 1273505663 is 3665053721.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1273505663 - 2⁶ = 1273505599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1273505669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 636752831 + 636752832.

It is an arithmetic number, because the mean of its divisors is an integer number (636752832).

Almost surely, 2^1273505663 is an apocalyptic number.

1273505663 is a deficient number, since it is larger than the sum of its proper divisors (1).

1273505663 is an equidigital number, since it uses as much as digits as its factorization.

1273505663 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 113400, while the sum is 38.

The square root of 1273505663 is about 35686.2111045709. The cubic root of 1273505663 is about 1083.9276465621.

The spelling of 1273505663 in words is "one billion, two hundred seventy-three million, five hundred five thousand, six hundred sixty-three".