27766377409 has 2 divisors, whose sum is σ = 27766377410. Its totient is φ = 27766377408.

The previous prime is 27766377313. The next prime is 27766377449. The reversal of 27766377409 is 90477366772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27036567184 + 729810225 = 164428^2 + 27015^2 .

It is a cyclic number.

It is not a de Polignac number, because 27766377409 - 2²⁹ = 27229506497 is a prime.

It is not a weakly prime, because it can be changed into another prime (27766377449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13883188704 + 13883188705.

It is an arithmetic number, because the mean of its divisors is an integer number (13883188705).

Almost surely, 2^27766377409 is an apocalyptic number.

It is an amenable number.

27766377409 is a deficient number, since it is larger than the sum of its proper divisors (1).

27766377409 is an equidigital number, since it uses as much as digits as its factorization.

27766377409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18670176, while the sum is 58.

The spelling of 27766377409 in words is "twenty-seven billion, seven hundred sixty-six million, three hundred seventy-seven thousand, four hundred nine".