15545441449 has 2 divisors, whose sum is σ = 15545441450. Its totient is φ = 15545441448.

The previous prime is 15545441437. The next prime is 15545441473. The reversal of 15545441449 is 94414454551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14083755625 + 1461685824 = 118675^2 + 38232^2 .

It is an emirp because it is prime and its reverse (94414454551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15545441449 - 2¹¹ = 15545439401 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 15545441399 and 15545441408.

It is not a weakly prime, because it can be changed into another prime (15545441749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7772720724 + 7772720725.

It is an arithmetic number, because the mean of its divisors is an integer number (7772720725).

Almost surely, 2^15545441449 is an apocalyptic number.

It is an amenable number.

15545441449 is a deficient number, since it is larger than the sum of its proper divisors (1).

15545441449 is an equidigital number, since it uses as much as digits as its factorization.

15545441449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152000, while the sum is 46.

The spelling of 15545441449 in words is "fifteen billion, five hundred forty-five million, four hundred forty-one thousand, four hundred forty-nine".