1063605661 has 2 divisors, whose sum is σ = 1063605662. Its totient is φ = 1063605660.

The previous prime is 1063605593. The next prime is 1063605671. The reversal of 1063605661 is 1665063601.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 713691225 + 349914436 = 26715^2 + 18706^2 .

It is an emirp because it is prime and its reverse (1665063601) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1063605661 - 2⁷ = 1063605533 is a prime.

It is a super-2 number, since 2×1063605661² = 2262514004222493842, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1063605671) 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, 531802830 + 531802831.

It is an arithmetic number, because the mean of its divisors is an integer number (531802831).

Almost surely, 2^1063605661 is an apocalyptic number.

It is an amenable number.

1063605661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1063605661 is an equidigital number, since it uses as much as digits as its factorization.

1063605661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 1063605661 is about 32612.9676815833. The cubic root of 1063605661 is about 1020.7676078204.

The spelling of 1063605661 in words is "one billion, sixty-three million, six hundred five thousand, six hundred sixty-one".