27777322109 has 2 divisors, whose sum is σ = 27777322110. Its totient is φ = 27777322108.

The previous prime is 27777322093. The next prime is 27777322121. The reversal of 27777322109 is 90122377772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19327116484 + 8450205625 = 139022^2 + 91925^2 .

It is a cyclic number.

It is not a de Polignac number, because 27777322109 - 2⁴ = 27777322093 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27777322129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13888661054 + 13888661055.

It is an arithmetic number, because the mean of its divisors is an integer number (13888661055).

Almost surely, 2^27777322109 is an apocalyptic number.

It is an amenable number.

27777322109 is a deficient number, since it is larger than the sum of its proper divisors (1).

27777322109 is an equidigital number, since it uses as much as digits as its factorization.

27777322109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 518616, while the sum is 47.

The spelling of 27777322109 in words is "twenty-seven billion, seven hundred seventy-seven million, three hundred twenty-two thousand, one hundred nine".