27780444541 has 2 divisors, whose sum is σ = 27780444542. Its totient is φ = 27780444540.

The previous prime is 27780444493. The next prime is 27780444553. The reversal of 27780444541 is 14544408772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22493700441 + 5286744100 = 149979^2 + 72710^2 .

It is a cyclic number.

It is not a de Polignac number, because 27780444541 - 2¹¹ = 27780442493 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 27780444491 and 27780444500.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27780444581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13890222270 + 13890222271.

It is an arithmetic number, because the mean of its divisors is an integer number (13890222271).

Almost surely, 2^27780444541 is an apocalyptic number.

It is an amenable number.

27780444541 is a deficient number, since it is larger than the sum of its proper divisors (1).

27780444541 is an equidigital number, since it uses as much as digits as its factorization.

27780444541 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1003520, while the sum is 46.

The spelling of 27780444541 in words is "twenty-seven billion, seven hundred eighty million, four hundred forty-four thousand, five hundred forty-one".