1660645214563 has 2 divisors, whose sum is σ = 1660645214564. Its totient is φ = 1660645214562.

The previous prime is 1660645214561. The next prime is 1660645214609. The reversal of 1660645214563 is 3654125460661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1660645214563 - 2¹ = 1660645214561 is a prime.

Together with 1660645214561, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1660645214561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830322607281 + 830322607282.

It is an arithmetic number, because the mean of its divisors is an integer number (830322607282).

Almost surely, 2^{1660645214563} is an apocalyptic number.

1660645214563 is a deficient number, since it is larger than the sum of its proper divisors (1).

1660645214563 is an equidigital number, since it uses as much as digits as its factorization.

1660645214563 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3110400, while the sum is 49.

The spelling of 1660645214563 in words is "one trillion, six hundred sixty billion, six hundred forty-five million, two hundred fourteen thousand, five hundred sixty-three".