1366520993 has 2 divisors, whose sum is σ = 1366520994. Its totient is φ = 1366520992.

The previous prime is 1366520971. The next prime is 1366521019. The reversal of 1366520993 is 3990256631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1273918864 + 92602129 = 35692^2 + 9623^2 .

It is a cyclic number.

It is not a de Polignac number, because 1366520993 - 2⁸ = 1366520737 is a prime.

It is not a weakly prime, because it can be changed into another prime (1366520933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 683260496 + 683260497.

It is an arithmetic number, because the mean of its divisors is an integer number (683260497).

Almost surely, 2^1366520993 is an apocalyptic number.

It is an amenable number.

1366520993 is a deficient number, since it is larger than the sum of its proper divisors (1).

1366520993 is an equidigital number, since it uses as much as digits as its factorization.

1366520993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 262440, while the sum is 44.

The square root of 1366520993 is about 36966.4847260326. The cubic root of 1366520993 is about 1109.6996165247.

The spelling of 1366520993 in words is "one billion, three hundred sixty-six million, five hundred twenty thousand, nine hundred ninety-three".