27780805523 has 2 divisors, whose sum is σ = 27780805524. Its totient is φ = 27780805522.

The previous prime is 27780805513. The next prime is 27780805531. The reversal of 27780805523 is 32550808772.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27780805523 - 2⁸ = 27780805267 is a prime.

It is not a weakly prime, because it can be changed into another prime (27780805513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13890402761 + 13890402762.

It is an arithmetic number, because the mean of its divisors is an integer number (13890402762).

Almost surely, 2^27780805523 is an apocalyptic number.

27780805523 is a deficient number, since it is larger than the sum of its proper divisors (1).

27780805523 is an equidigital number, since it uses as much as digits as its factorization.

27780805523 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 940800, while the sum is 47.

The spelling of 27780805523 in words is "twenty-seven billion, seven hundred eighty million, eight hundred five thousand, five hundred twenty-three".