1664745614989 has 2 divisors, whose sum is σ = 1664745614990. Its totient is φ = 1664745614988.

The previous prime is 1664745614977. The next prime is 1664745615011. The reversal of 1664745614989 is 9894165474661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1215219616900 + 449525998089 = 1102370^2 + 670467^2 .

It is a cyclic number.

It is not a de Polignac number, because 1664745614989 - 2⁵ = 1664745614957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1664745614089) 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, 832372807494 + 832372807495.

It is an arithmetic number, because the mean of its divisors is an integer number (832372807495).

Almost surely, 2^{1664745614989} is an apocalyptic number.

It is an amenable number.

1664745614989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1664745614989 is an equidigital number, since it uses as much as digits as its factorization.

1664745614989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 313528320, while the sum is 70.

The spelling of 1664745614989 in words is "one trillion, six hundred sixty-four billion, seven hundred forty-five million, six hundred fourteen thousand, nine hundred eighty-nine".