1366663553 has 2 divisors, whose sum is σ = 1366663554. Its totient is φ = 1366663552.

The previous prime is 1366663517. The next prime is 1366663607. The reversal of 1366663553 is 3553666631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1170187264 + 196476289 = 34208^2 + 14017^2 .

It is a cyclic number.

It is not a de Polignac number, because 1366663553 - 2⁸ = 1366663297 is a prime.

It is not a weakly prime, because it can be changed into another prime (1366663513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 683331776 + 683331777.

It is an arithmetic number, because the mean of its divisors is an integer number (683331777).

Almost surely, 2^1366663553 is an apocalyptic number.

It is an amenable number.

1366663553 is a deficient number, since it is larger than the sum of its proper divisors (1).

1366663553 is an equidigital number, since it uses as much as digits as its factorization.

1366663553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 874800, while the sum is 44.

The square root of 1366663553 is about 36968.4129088605. The cubic root of 1366663553 is about 1109.7382043638.

The spelling of 1366663553 in words is "one billion, three hundred sixty-six million, six hundred sixty-three thousand, five hundred fifty-three".