13728396641 has 2 divisors, whose sum is σ = 13728396642. Its totient is φ = 13728396640.

The previous prime is 13728396589. The next prime is 13728396659. The reversal of 13728396641 is 14669382731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12128396641 + 1600000000 = 110129^2 + 40000^2 .

It is a cyclic number.

It is not a de Polignac number, because 13728396641 - 2¹⁰ = 13728395617 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13728396641.

It is not a weakly prime, because it can be changed into another prime (13728392641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6864198320 + 6864198321.

It is an arithmetic number, because the mean of its divisors is an integer number (6864198321).

Almost surely, 2^13728396641 is an apocalyptic number.

It is an amenable number.

13728396641 is a deficient number, since it is larger than the sum of its proper divisors (1).

13728396641 is an equidigital number, since it uses as much as digits as its factorization.

13728396641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 50.

The spelling of 13728396641 in words is "thirteen billion, seven hundred twenty-eight million, three hundred ninety-six thousand, six hundred forty-one".