27780444973 has 2 divisors, whose sum is σ = 27780444974. Its totient is φ = 27780444972.

The previous prime is 27780444917. The next prime is 27780445001. The reversal of 27780444973 is 37944408772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18686343204 + 9094101769 = 136698^2 + 95363^2 .

It is a cyclic number.

It is not a de Polignac number, because 27780444973 - 2¹⁷ = 27780313901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27780444173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13890222486 + 13890222487.

It is an arithmetic number, because the mean of its divisors is an integer number (13890222487).

Almost surely, 2^27780444973 is an apocalyptic number.

It is an amenable number.

27780444973 is a deficient number, since it is larger than the sum of its proper divisors (1).

27780444973 is an equidigital number, since it uses as much as digits as its factorization.

27780444973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9483264, while the sum is 55.

The spelling of 27780444973 in words is "twenty-seven billion, seven hundred eighty million, four hundred forty-four thousand, nine hundred seventy-three".