27765013777789 has 2 divisors, whose sum is σ = 27765013777790. Its totient is φ = 27765013777788.

The previous prime is 27765013777717. The next prime is 27765013777849. The reversal of 27765013777789 is 98777731056772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27725753525625 + 39260252164 = 5265525^2 + 198142^2 .

It is a cyclic number.

It is not a de Polignac number, because 27765013777789 - 2¹⁹ = 27765013253501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27765043777789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13882506888894 + 13882506888895.

It is an arithmetic number, because the mean of its divisors is an integer number (13882506888895).

Almost surely, 2^{27765013777789} is an apocalyptic number.

It is an amenable number.

27765013777789 is a deficient number, since it is larger than the sum of its proper divisors (1).

27765013777789 is an equidigital number, since it uses as much as digits as its factorization.

27765013777789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1524731040, while the sum is 76.

The spelling of 27765013777789 in words is "twenty-seven trillion, seven hundred sixty-five billion, thirteen million, seven hundred seventy-seven thousand, seven hundred eighty-nine".