1648889138989 has 2 divisors, whose sum is σ = 1648889138990. Its totient is φ = 1648889138988.

The previous prime is 1648889138933. The next prime is 1648889138993. The reversal of 1648889138989 is 9898319888461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1204633563364 + 444255575625 = 1097558^2 + 666525^2 .

It is a cyclic number.

It is not a de Polignac number, because 1648889138989 - 2⁷ = 1648889138861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1648889138909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 824444569494 + 824444569495.

It is an arithmetic number, because the mean of its divisors is an integer number (824444569495).

Almost surely, 2^{1648889138989} is an apocalyptic number.

It is an amenable number.

1648889138989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1648889138989 is an equidigital number, since it uses as much as digits as its factorization.

1648889138989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1719926784, while the sum is 82.

The spelling of 1648889138989 in words is "one trillion, six hundred forty-eight billion, eight hundred eighty-nine million, one hundred thirty-eight thousand, nine hundred eighty-nine".