15639485984849 has 2 divisors, whose sum is σ = 15639485984850. Its totient is φ = 15639485984848.

The previous prime is 15639485984809. The next prime is 15639485984893. The reversal of 15639485984849 is 94848958493651.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14640571690000 + 998914294849 = 3826300^2 + 999457^2 .

It is an emirp because it is prime and its reverse (94848958493651) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15639485984849 - 2¹⁶ = 15639485919313 is a prime.

It is not a weakly prime, because it can be changed into another prime (15639485984809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7819742992424 + 7819742992425.

It is an arithmetic number, because the mean of its divisors is an integer number (7819742992425).

Almost surely, 2^{15639485984849} is an apocalyptic number.

It is an amenable number.

15639485984849 is a deficient number, since it is larger than the sum of its proper divisors (1).

15639485984849 is an equidigital number, since it uses as much as digits as its factorization.

15639485984849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10749542400, while the sum is 83.

The spelling of 15639485984849 in words is "fifteen trillion, six hundred thirty-nine billion, four hundred eighty-five million, nine hundred eighty-four thousand, eight hundred forty-nine".