13897661573 has 2 divisors, whose sum is σ = 13897661574. Its totient is φ = 13897661572.

The previous prime is 13897661563. The next prime is 13897661597. The reversal of 13897661573 is 37516679831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10526349604 + 3371311969 = 102598^2 + 58063^2 .

It is a cyclic number.

It is not a de Polignac number, because 13897661573 - 2¹⁰ = 13897660549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13897661563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6948830786 + 6948830787.

It is an arithmetic number, because the mean of its divisors is an integer number (6948830787).

Almost surely, 2^13897661573 is an apocalyptic number.

It is an amenable number.

13897661573 is a deficient number, since it is larger than the sum of its proper divisors (1).

13897661573 is an equidigital number, since it uses as much as digits as its factorization.

13897661573 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5715360, while the sum is 56.

The spelling of 13897661573 in words is "thirteen billion, eight hundred ninety-seven million, six hundred sixty-one thousand, five hundred seventy-three".