13971666239939 has 2 divisors, whose sum is σ = 13971666239940. Its totient is φ = 13971666239938.

The previous prime is 13971666239831. The next prime is 13971666240011. The reversal of 13971666239939 is 93993266617931.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13971666239939 is a prime.

It is not a weakly prime, because it can be changed into another prime (13971656239939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6985833119969 + 6985833119970.

It is an arithmetic number, because the mean of its divisors is an integer number (6985833119970).

Almost surely, 2^{13971666239939} is an apocalyptic number.

13971666239939 is a deficient number, since it is larger than the sum of its proper divisors (1).

13971666239939 is an equidigital number, since it uses as much as digits as its factorization.

13971666239939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 535692528, while the sum is 74.

The spelling of 13971666239939 in words is "thirteen trillion, nine hundred seventy-one billion, six hundred sixty-six million, two hundred thirty-nine thousand, nine hundred thirty-nine".