15555446449 has 2 divisors, whose sum is σ = 15555446450. Its totient is φ = 15555446448.

The previous prime is 15555446407. The next prime is 15555446477. The reversal of 15555446449 is 94464455551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11182005025 + 4373441424 = 105745^2 + 66132^2 .

It is a cyclic number.

It is not a de Polignac number, because 15555446449 - 2¹⁹ = 15554922161 is a prime.

It is a super-3 number, since 3×15555446449³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 15555446396 and 15555446405.

It is not a weakly prime, because it can be changed into another prime (15555446479) 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, 7777723224 + 7777723225.

It is an arithmetic number, because the mean of its divisors is an integer number (7777723225).

Almost surely, 2^15555446449 is an apocalyptic number.

It is an amenable number.

15555446449 is a deficient number, since it is larger than the sum of its proper divisors (1).

15555446449 is an equidigital number, since it uses as much as digits as its factorization.

15555446449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640000, while the sum is 52.

The spelling of 15555446449 in words is "fifteen billion, five hundred fifty-five million, four hundred forty-six thousand, four hundred forty-nine".