1643300016389 has 2 divisors, whose sum is σ = 1643300016390. Its totient is φ = 1643300016388.

The previous prime is 1643300016383. The next prime is 1643300016473. The reversal of 1643300016389 is 9836100033461.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1507942248289 + 135357768100 = 1227983^2 + 367910^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1643300016389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1643300016383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821650008194 + 821650008195.

It is an arithmetic number, because the mean of its divisors is an integer number (821650008195).

Almost surely, 2^{1643300016389} is an apocalyptic number.

It is an amenable number.

1643300016389 is a deficient number, since it is larger than the sum of its proper divisors (1).

1643300016389 is an equidigital number, since it uses as much as digits as its factorization.

1643300016389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 279936, while the sum is 44.

The spelling of 1643300016389 in words is "one trillion, six hundred forty-three billion, three hundred million, sixteen thousand, three hundred eighty-nine".