27780583549 has 2 divisors, whose sum is σ = 27780583550. Its totient is φ = 27780583548.

The previous prime is 27780583529. The next prime is 27780583613. The reversal of 27780583549 is 94538508772.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25605760324 + 2174823225 = 160018^2 + 46635^2 .

It is a cyclic number.

It is not a de Polignac number, because 27780583549 - 2⁹ = 27780583037 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 27780583493 and 27780583502.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27780583529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13890291774 + 13890291775.

It is an arithmetic number, because the mean of its divisors is an integer number (13890291775).

Almost surely, 2^27780583549 is an apocalyptic number.

It is an amenable number.

27780583549 is a deficient number, since it is larger than the sum of its proper divisors (1).

27780583549 is an equidigital number, since it uses as much as digits as its factorization.

27780583549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16934400, while the sum is 58.

The spelling of 27780583549 in words is "twenty-seven billion, seven hundred eighty million, five hundred eighty-three thousand, five hundred forty-nine".