13950666438889 has 2 divisors, whose sum is σ = 13950666438890. Its totient is φ = 13950666438888.

The previous prime is 13950666438881. The next prime is 13950666438937. The reversal of 13950666438889 is 98883466605931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13477746152025 + 472920286864 = 3671205^2 + 687692^2 .

It is a cyclic number.

It is not a de Polignac number, because 13950666438889 - 2³ = 13950666438881 is a prime.

It is not a weakly prime, because it can be changed into another prime (13950666438881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6975333219444 + 6975333219445.

It is an arithmetic number, because the mean of its divisors is an integer number (6975333219445).

Almost surely, 2^{13950666438889} is an apocalyptic number.

It is an amenable number.

13950666438889 is a deficient number, since it is larger than the sum of its proper divisors (1).

13950666438889 is an equidigital number, since it uses as much as digits as its factorization.

13950666438889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1612431360, while the sum is 76.

The spelling of 13950666438889 in words is "thirteen trillion, nine hundred fifty billion, six hundred sixty-six million, four hundred thirty-eight thousand, eight hundred eighty-nine".