1366001603 has 2 divisors, whose sum is σ = 1366001604. Its totient is φ = 1366001602.

The previous prime is 1366001591. The next prime is 1366001677. The reversal of 1366001603 is 3061006631.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1366001603 - 2¹⁰ = 1366000579 is a prime.

It is not a weakly prime, because it can be changed into another prime (1366001503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 683000801 + 683000802.

It is an arithmetic number, because the mean of its divisors is an integer number (683000802).

Almost surely, 2^1366001603 is an apocalyptic number.

1366001603 is a deficient number, since it is larger than the sum of its proper divisors (1).

1366001603 is an equidigital number, since it uses as much as digits as its factorization.

1366001603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 1366001603 is about 36959.4589110826. The cubic root of 1366001603 is about 1109.5590064343.

The spelling of 1366001603 in words is "one billion, three hundred sixty-six million, one thousand, six hundred three".