27565349789 has 2 divisors, whose sum is σ = 27565349790. Its totient is φ = 27565349788.

The previous prime is 27565349743. The next prime is 27565349797. The reversal of 27565349789 is 98794356572.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23373823225 + 4191526564 = 152885^2 + 64742^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27565349789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27565349089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13782674894 + 13782674895.

It is an arithmetic number, because the mean of its divisors is an integer number (13782674895).

Almost surely, 2^27565349789 is an apocalyptic number.

It is an amenable number.

27565349789 is a deficient number, since it is larger than the sum of its proper divisors (1).

27565349789 is an equidigital number, since it uses as much as digits as its factorization.

27565349789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 114307200, while the sum is 65.

The spelling of 27565349789 in words is "twenty-seven billion, five hundred sixty-five million, three hundred forty-nine thousand, seven hundred eighty-nine".