13555555549 has 2 divisors, whose sum is σ = 13555555550. Its totient is φ = 13555555548.

The previous prime is 13555555543. The next prime is 13555555571. The reversal of 13555555549 is 94555555531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12224619225 + 1330936324 = 110565^2 + 36482^2 .

It is a cyclic number.

It is not a de Polignac number, because 13555555549 - 2⁹ = 13555555037 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13555555496 and 13555555505.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13555555543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6777777774 + 6777777775.

It is an arithmetic number, because the mean of its divisors is an integer number (6777777775).

Almost surely, 2^13555555549 is an apocalyptic number.

It is an amenable number.

13555555549 is a deficient number, since it is larger than the sum of its proper divisors (1).

13555555549 is an equidigital number, since it uses as much as digits as its factorization.

13555555549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8437500, while the sum is 52.

The spelling of 13555555549 in words is "thirteen billion, five hundred fifty-five million, five hundred fifty-five thousand, five hundred forty-nine".