1555550225249 has 2 divisors, whose sum is σ = 1555550225250. Its totient is φ = 1555550225248.

The previous prime is 1555550225233. The next prime is 1555550225263. The reversal of 1555550225249 is 9425220555551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 997937065024 + 557613160225 = 998968^2 + 746735^2 .

It is a cyclic number.

It is not a de Polignac number, because 1555550225249 - 2⁴ = 1555550225233 is a prime.

It is a super-3 number, since 3×1555550225249³ (a number of 38 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 1555550225197 and 1555550225206.

It is not a weakly prime, because it can be changed into another prime (1555550225269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 777775112624 + 777775112625.

It is an arithmetic number, because the mean of its divisors is an integer number (777775112625).

Almost surely, 2^{1555550225249} is an apocalyptic number.

It is an amenable number.

1555550225249 is a deficient number, since it is larger than the sum of its proper divisors (1).

1555550225249 is an equidigital number, since it uses as much as digits as its factorization.

1555550225249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4500000, while the sum is 50.

The spelling of 1555550225249 in words is "one trillion, five hundred fifty-five billion, five hundred fifty million, two hundred twenty-five thousand, two hundred forty-nine".