27640436777 has 2 divisors, whose sum is σ = 27640436778. Its totient is φ = 27640436776.

The previous prime is 27640436749. The next prime is 27640436807. The reversal of 27640436777 is 77763404672.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20683041856 + 6957394921 = 143816^2 + 83411^2 .

It is a cyclic number.

It is not a de Polignac number, because 27640436777 - 2¹² = 27640432681 is a prime.

It is not a weakly prime, because it can be changed into another prime (27640436177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13820218388 + 13820218389.

It is an arithmetic number, because the mean of its divisors is an integer number (13820218389).

Almost surely, 2^27640436777 is an apocalyptic number.

It is an amenable number.

27640436777 is a deficient number, since it is larger than the sum of its proper divisors (1).

27640436777 is an equidigital number, since it uses as much as digits as its factorization.

27640436777 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8297856, while the sum is 53.

The spelling of 27640436777 in words is "twenty-seven billion, six hundred forty million, four hundred thirty-six thousand, seven hundred seventy-seven".