1305630665661 has 12 divisors (see below), whose sum is σ = 2025059808192. Its totient is φ = 746074666008.

The previous prime is 1305630665623. The next prime is 1305630665699. The reversal of 1305630665661 is 1665660365031.

It is an interprime number because it is at equal distance from previous prime (1305630665623) and next prime (1305630665699).

It is not a de Polignac number, because 1305630665661 - 2⁶ = 1305630665597 is a prime.

It is a super-2 number, since 2×1305630665661² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1305630665661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1305630685661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4440920485 + ... + 4440920778.

It is an arithmetic number, because the mean of its divisors is an integer number (168754984016).

Almost surely, 2^{1305630665661} is an apocalyptic number.

It is an amenable number.

1305630665661 is a deficient number, since it is larger than the sum of its proper divisors (719429142531).

1305630665661 is an equidigital number, since it uses as much as digits as its factorization.

1305630665661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8881841280 (or 8881841273 counting only the distinct ones).

The product of its (nonzero) digits is 1749600, while the sum is 48.

The spelling of 1305630665661 in words is "one trillion, three hundred five billion, six hundred thirty million, six hundred sixty-five thousand, six hundred sixty-one".