13988690205989 has 2 divisors, whose sum is σ = 13988690205990. Its totient is φ = 13988690205988.

The previous prime is 13988690205979. The next prime is 13988690206033. The reversal of 13988690205989 is 98950209688931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13678591577764 + 310098628225 = 3698458^2 + 556865^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13988690205989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13988690205979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6994345102994 + 6994345102995.

It is an arithmetic number, because the mean of its divisors is an integer number (6994345102995).

Almost surely, 2^{13988690205989} is an apocalyptic number.

It is an amenable number.

13988690205989 is a deficient number, since it is larger than the sum of its proper divisors (1).

13988690205989 is an equidigital number, since it uses as much as digits as its factorization.

13988690205989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 604661760, while the sum is 77.

The spelling of 13988690205989 in words is "thirteen trillion, nine hundred eighty-eight billion, six hundred ninety million, two hundred five thousand, nine hundred eighty-nine".